Main changes:
 - Improved stability in online multiplayer matches;
 - Improved voice chat quality for PCs running Windows Vista;
 - Improved navigation through game's menus.

The PC day-one update also includes the improvements from the latest title update for the console version:
 - Introduced 6-man party system in the multiplayer game mode;
 - Balanced several weapons (assault rifles, SMSGs, handguns, shotguns);
 - Balanced equipment (grenades, flash bang, EMP, stun guns, number of drones in match);
 - Adjusted aim sensitivity and quick scope;
 - Fixed map exploits;
 - Adjusted melee;
 - Adjusted XP values;
 - Several technical / network improvements.