Free exclusive content:
-a special hardcore mode for the campaign;
-night variants of two adversarial maps: Market & Harbor;
-Performance improved;
-Online stability improved;
-Integration of all Consoles' Title Updates;
-A fix for many issues reported by the community;
-Added support for GeForce GT600 and Radeon HD7000 series;
-Shadows quality on Guerrilla maps improved;
-Grenade effect improved;
-Crash with squad invites fixed;
-Small freezes on Multiplayer maps fixed;
-Issues when loosing network connection in Guerrilla mode fixed;
-Respec token requirement removed;
-MP-412 handgun and additional weapon skins are unlocked for all.

Hardcore mode - With Title Update 1.6, PC players benefit from an exclusive hardcore mode for the campaign. Here’s what you can expect:
-Teammates are less resistant;
-Optical camo deactivated if the player moves;
-Several changes to the intel; eg: sensor grenades only last for 3 seconds, drones & goggles less 'powerful';
-Enemies shoot much more quickly when equipped with weapons such as RPG, shotguns, snipers;
-Players die… much more quickly… and regen is slow;
-More lethal (+30% damage);
-Less bullets.

Additional Notes:
-Added the support for the 'Raven Strike' and 'Khyber Strike' DLC.
-Improved performance on complex maps, e.g. 'Shattered Mountain'.
-Improved visual quality.
-Changed global illumination on most maps. ‘Global Illumination’ option has to be re-adjusted again in Graphics Options to reflect change in performance.