The update adds a new higher difficulty setting for those that have already reached level 145, which includes new achievements and weapons.
It also adds the ability for players to join games mid-heist, which is nice.
It's downloadable now for PC and PS3. Here's the full update list:
• Masks of Disguise: Feeling stately?Presidential masks are now available to those players that have reached level 145. Players can grab a Golden mask when all heists are completed on OVERKILL 145+. BEEEF masks have also been added to the game, and can be picked up in the lobby.
• OVERKILL 145+: Players that have reached level 145 can now play on a new difficulty called OVERKILL 145+, which opens up the possibility for new events and achievements. It also unlocks new weapons, such as the crowbar to open doors, as well as leaderboards.
• DROP-IN: With the added in-game drop-in ability, players can set the server to allow for others to join the game mid-heist. Players can also filter players by setting server reputation and difficulty requirements.
• SWAT Tactics: The SWAT captain has trained a slew of new recruits, resulting in challenging new tactics and counter measures for players to face on each of the heists.
• Sweet Moves: Players can check out new weapon animations for the Shotgun. Law enforcers now move more tactically than ever before. Even civilians have new dance animations in the DIAMOND HEIST.
• Portrait Window Additions: Players can now see the name of the character they are currently playing in the portrait window while in game.