GENERAL
 
•Release Date [33]
 - October 9th North America
 - October 12th International
•Collectors Edition [33]
 - PC only
 - "several goodies like an art book, fold-out poster of the XCOM headquarters, XCOM insignia patch, and even some digital stuff like the soundtrack, special art, and more." - 2K Greg
•Difficulty settings [E]
 - Easy
 - Normal
 - Hard
 - "Classic"
 - Impossible (how long will you last -mode) [37]
• Ironman mode [E]
 - Toggle at campaign start.
 - Auto-save only, one savegame.
• Interface
 - PC version will have an "enhanced" UI compared to the console. [12]
 - XBOX/PS3, free movement in tactical. [E]
 - PC version, grid overlay in tactical. [E]
 - "Glam-Cam" on/off setting. [31]
 - Soldier voice on/off setting. [31]
 - Possible HP-bar and damage hide/view in-game setting. [31]
 
STRATEGICAL
 
•Funding Council 
- 16 Countries, game over if 8 or more countries lost. [H]
 - Funding and resource bonuses varies [12, 16, 36]
 
- North America, "Air and Space" - All aircraft and aircraft weapons cost 50% less to purchase, build and maintain.
 - Europe, "Expert Knowledge" - Labs and workshops cost 50% less to build and maintain.
 - Asia, "Future Combat" - All projects in the foundry and the Officer Training school cost 50% less.
 - South America "We Have Ways" - Autopsies and Interrogations are completed instantly.
 - Africa, "All In" - Monthly XCOM funding increased by 25%.
•Trade & Missions continually [9]
• Satellite Cover for UFO detection
 - Bonus for complete satellite coverage of continents. [16]
 - Satellites can be lost. [35]
•One base only [27]
 - Hangar bases for Interceptors on multiple continents 
- North America, South America, Asia, Africa, Europe confirmed [C]
 - Up to 4 Interceptors per interceptor-base. [C]
 
Missions
 • Randomly generated mission names. [20]
•Mission types
 - 2-10 types of missions [L]
 - Abductions
 - Terror missions
 - Hostage Extraction [27]
 - VIP rescue, (player controlled VIP) [27, L]
 - UFO Crash site [32]
 - Capture alive alien [34]
• Enviroments [J]
 - Urban
 - Outdoors
 - Alien environments
•Story or "Set type" missions. [14]
•Large number of hand-crafted maps. [20]
 - Unit placement procedurally generated.
• Mission Accomplished Screen [D at 15:25]
 - Aliens Killed (6, Excellent!)
 - X-Com Operatives Lost (1, Good)
• Mission Debrief Screen
 - New Research Available (Xeno-Biology, Weapon Fragments, Alien Materials)
 - Artefacts Recovered (2x Sectoid Corpse, 2x Muton Corpse, 14x Weapon Fragments)
• NPCs confirmed
 - Targets for aliens.
• Multiple attacks at once, player have to choose.
 - ""There is not just one group of aliens invading, they are hitting 2 cities at once, or three, or four. You have to make a decision, am I going to Hong Kong or ....." 
- "..where ever they don't respond to, they have the risk of loosing that country or increasign the panic-meter....." -Casey O'Toole on PAX. [E at 4:16:00].
 
Crafts
 • Interceptor [D at 17:28]
 - One weapon mount (Cannon may be standard side-arm)
• Weapons [M]
 -Stats
 
- Hit% chance
 - Range
 - Fire rate
 - Damage
 - Armour Penetration
- Avalanche Missile
 - Laser Cannon
 - Plasma Cannon
 
Research
 • Item capture and resource requirement for research. [A, 31]
• Each and every research grants some gameplay bonus, not some only narrative. [31]
• Projects 
- Xeno-Biology
 
Slow (12 days)
 Project Cost: 3 Sectoid Corpse
- Weapon Fragments
 
Normal (6 days)
 Project Cost: 5 Weapon fragments
- Alien Materials
 
Normal (6 days)
 Project Cost: 5 Weapon fragments
 
Base facilities
 •Static facilities [17]
 - Hangar
 - Mission Control
 - Situation Room - funding council.
 - Armory
 - Barrack
 - Science Labs (?)
 - Engineering (?)
 - Infirmary (?)
• Expandable facilities 
- Alien Containment
 - Officer Training School - global perk unlocks for squad
 - Laboratories - boosts Science Lab
 - Workshop - boost Engineering, "Random resource rebate on whatever you built". -GI
 - The Foundry - large manufacturing projects
 - Power Generator [A]
 - Thermal Power Generator - more power, require steam vent 
 - Satellite Nexus [A]
 - Satellite Uplink - "monitor the airspace over different countries around the world." [A]
• 24 facility expansion slots [27]
• Bonus depending on adjacent facilities [D]
• Base resource: Power [A]
 
TACTICAL
 
Gameplay Mechanics
 • Fog of War [3,9]
• Panic [9,12]
• Cover, looks like three types [screenshots]
 - Ability: "Hunker down", double defence, penalty to vision and cost one turn. [16]
• Line of Sight [3,9]
• Day and Night [9]
 - "No gameplay effect for lighting..."
 - "... better visibility at night, but more shadows at day." - Jake Solomon [35]
• TUs replaced with Move-Action mechanics instead. [9,12,13]
 - Displayed by two small "play" arrows in UI. 
- Two movements possible, UI displays range of Move-Action on ground. [D]
• Inventory grid page removed, replaced with an Ability Bar. [3, 14]
 - Still some type of inventory "slots" pre-mission.
• Critical Wounds, possible to revive but suffers permanent penalty to Will stat (panic). [14,15]
• Destructible environments [10,12]
 - Walls and Cover destruct able, Roofs or Ground are not.
• Overwatch [21]
• Weapons explode into weapon fragments [Video A at 4:06]
• Auto-deployment, no Skyranger unload. [27]
• Doors can be opened in several ways [27] 
Aliens 
• Weapons [D,E]
 
- Plasma Pistol
 - Plasma Rifle
 - Heavy Plasma Rifle
 - Alien Grenade
 - Alien weapons disintegrate to fragments upon death. [31]
 - Alive captured aliens keeps weapons intact (required for high-tier tech capture). [31]
•Sectoids
 - Ability: Mind Merge, extra health (but can kill both aliens). [11]
•Mutons
 - Ability: Blood Call, group combat bonuses. [7]
•Cyberdiscs
 - Two forms [7, screenshots]
 - Throws Grenades [J]
•Thin Man (new alien type)
 - High mobility, poison [7]
•Berzerker (new alien type) [23]
 - Muton like, Heavy armoured, Close combat
 - Can destroy environments. 
- If damaged, will move torwards attacker regardless of turn. [E]
• Floater [29, F at 13:29]
 - Flying
 - Ability: Boost: fly straight up off screen and land anywhere on the map. [M]
 - Improved grenade ability (Heavy?). 
• Heavy Floater [K]
• Chrysalids [G]
 - High mobility, can jump multiple levels. 
 - Units killed by the Chrysalid turn into new Chrysalids unless killed in a couple of turns. [K]
•Alien "Hero" units, (psionic type hinted at) [14]
• "The Drone" [K]
 - Heals robotic units
• Sectopod [K]
 - Large bipedal mech unit.
 
Soldiers 
•Squad size start at four and can later upgrade to six. [9,12,20]
•Permanent death for soldiers [9]
•Class hidden until first promotion. [13]
•Choice of two abilities on level up (exclusively) [13]
• Stats
 - HP
 - Will
 - Defence
 - Aim
•Soldier customization [13,14]
 - First Name
 - Last Name
 - Nickname
 
* earned at Sergant rank. [15]
- Country
 - Race
 - Voice
 - Head
 - Skin Color
 - Hair
 - Hair Color
 - Facial Hair
 
Classes
 •Sniper
 - Ability: Squad Sight, fire at enemy seen by any in squad. [13]
 - Ability: Snap Shot, quick shot after movement. [13]
 - Ability: Double Tap, Allows both actions to be used for Standard Shot, Precision Shot, or Disabling Shot. provided no moves were made. 1 turn cooldown. [D at 16:27] 
- Ability: In the Zone, additional attack if a critical hit. [36]
 - Improved Overwatch, unit turn does not 'end' as long as he keeps landing hits on aliens. [22]
•Heavy
 - Ability: Supression, reduce target Aim by 30 and take free shot if the target moves. [D]
 - Ability: Focused Suppression, reduce target Aim by 65 and take free shot if the target moves. [11, D]
 - Ability: Tracer Beam Rounds, if hit alien takes extra damage from entire squad. [22]
•Assault
 - Ability: Run & Gun, on the turn you activate Run & Gun, you can fire after Dashing. [GI screenshot]
 - Ability: Combat Stim, increase stats and reduce damage taken. [M]
•Support
 - Ability: Smoke Grenade [14] 
- Ability: Rifle Suppression, reduce target Aim by 15 and take free shot if the target move. [14, D]
 - Ability: Some type of Improved Heal [14]
 - Ability: Heal Wound, use the Medkit to heal up to 8 HP. [M]
• Psionic
 - Late game class 
 - Ability: Mind Control, Size control of this enemy for 5 turns. [K]
 - Ability: Panic [L]
 - Ability: Rift, Create a devestating psionic storm. (Free Aim, Limited range) [K]
 
SHIV
 •Mobile Weapons Platform [13]
•Takes place of 1 soldier.
•Multiple levels of chassi [J]
 - Cover type of chassi [J]
•Multiple levels of weapons [J]
 - Minigun
 - Laser Cannon [J]
 
Weapons
 • Basic 
- Sniper Rifle (takes two actions to fire) [12] - Unlimited
 - Assault Rifle - Unlimited
 - Shotgun (Assault class only) - Unlimited
 - LGM (Heavy Class only) - Unlimited
• Laser
 - Laser Rifle
 - Heavy Laser
 - Laser Sniper Rifle
 - Scatter Laser (shotgun type?) [J]
• Plasma
 - Light Plasma Rifle [J]
 - Plasma Rifle [G]
 - Heavy Plasma Rifle [J]
 - Plasma Sniper Rifle [G]
 - Alloy Cannon (plasma? shotgun type) [J]
• Stun
 - "Arc Thrower", close range stun weapon. [31]
•Throwable
 - Frag Grenade, Grenades explode on impact.
 - Smoke Grenade, (free aim) units in smoke are harder to hit. [M]
 
Upgrade: stats enhancing drugs for soldiers inside. [22]
- Battle Scanner, throw able sight improvement mechanic. [14] 
Armour 
• All soldiers can wear all types of items and armour. [14]
• Body Armour - unlimited (start armour presumably) [D at 16:27]
• Skeleton Suit, grapple hook to get to higher ground. [11]
• Carapace Armour (Requires research) [D at 16:27]
• Titan Armor (Requires research) [D at 16:27]
• Archangel Armour, flying [G]
• Ghost Armour, invisibility, limited charges (3) [G, K]
• "Psionic Enchancing Armour" [H] - Pete Murray
 
Equipment
 •Medkit
 - Temporary patch up a soldier's wound in combat, 2 charges.