The means guaranteed higher-res loveliness during cutscenes. There are various ”optimizations” according to the patch notes, and the team have tweaked some abilities.
Given what the patch changes in the game its a little alarming to see it at nearly 2GB but that’s perhaps linked to the 1080p video changes. Hopefully future updates will be smaller.
Patch notes (10/11/12):
• Various visibility/hiding optimizations
• Multiplayer text chat support (press J to activate)
• Mouse button 4/5 will switch soldiers in the Barracks
• ESC hides the movement grid, if you do not want to commit to a move while it is activated
• Squad Sight ability optimization
• Fixed issue when equipping two grenades with Deep Pockets.
• Fixed Rapid Fire sometimes consuming too much ammo.
• SHIVs that are damaged will no longer become unusable.
• Fixed some hangs/soft crashes in tactical combat.
• Replaced software cursor with the operating system cursor to reduce lag and framerate dependence.
• Fixed rendering bug which causes some soldier’s hair to appear as if it is rendering on top of environment fog.
• 1080p movies are now used at all times on the PC.
XCOM: Enemy Unknown releases on Xbox 360, PS3 and PC today in Europe.