Here is the list of fixes and updates:
General
-Enabled 4xAA (anti-aliasing) for 480i standard-def and 480p resolutions (was 2xAA).
-Enabled 4x anti-aliasing during initial player creation screen.
-Added player options to enable v-sync during.
cutscenes and/or gameplay, with warning that it will affect framerate.
-Fixed widescreen formatting issues in certain resolutions.
-Fixed issue where button icons would sometimes not appear during tagging activity.
-Fixed problem where camera could rapidly rotate around player when exiting vehicle.
-Added dialog reminding player to save before final mission in the game.
-Fixed rare crash bugs due to variants and fast shader constants.
-DLC - Car dealership now skips paint selection for car if the car has no color data.
-Fixed issue when signing out of a gamer profile on The Wheel Woman unlock screen.
-Added missing audio tracks to music stores, including Pickin Boogers.
-Added long sideburns and four other missing hairstyles to Shear Intensity salons.
Multiplayer
-Improvements to the way the game handles packet loss and bandwidth management between players. This addresses issues commonly cited as lag, and general synchronization problems between the players clients (vehicles/players warping around, etc).
-Various bandwidth optimizations.
-Fixed connection issues with gang servers (done server-side, update not required).
-The system for rating a players quality-of-service has been improved, and made less conservative. This means youll see many more matches with 10-12 player limits.
-Fixed clothes stealing exploit. Stolen clothes will be deleted, legit clothes will be unharmed.
-Various changes to Matchmaking phase, to get players in the game faster.
-Team-based, non-Gang games are now required to have even teams. Gang matches still allowed to be off-by-one to allow easier matchmaking, since single people cannot be matched-in.
-Fixed issue that could cause the Blinged Out Ride vehicle to get stuck inside the garage when the driver disconnects.
-Fixed crash that could happen during server migration.
-Fixed rank reporting errors in Leaderboards for Team Gang Brawl and Team Big Ass Chains.
-Fixed problem where end of games stats display could be improperly sorted.
-Fixed issue in server migration where statistics would not be properly updated for the newly selected server.
-Fixed issue where incorrect server was elected for game size.
-Fixed issue where car could get stuck in a chop shop or get pushed out of the level and destroyed.
-Added caching to pimp hat and multiplayer chains to reduce delay when they are loaded.
-Fixed problem where PC could become bald after importing from single-player savegame.
-Fixed problem where multiplayer garages had problems with client vehicles colliding at the entrance with an invisible mesh mover.
Item sync improvements.
-Fixed problem that could prevent twelve people from getting into a match due to not having enough security associations.
-Points stored in Big Ass Chains are now being reset between games.
-Fixed issue where gang stats retrieval could fail and not be retried.
-Addressed standby hack where a player would temporarily disconnect their network connection to move around without others seeing them.
-The proper number of custom vehicle choices now appears for the Hustlin multiplayer level.
-Gang sizes limited to 100 members.
-Fixed cases where gangs match but not all players get into the game.
-Only servers with sufficient bandwidth are selected to host a match.
-Fixed bug where multiplayer garages had problems with client vehicles colliding against unseen geometry.
-Big Ass Chains points scored stats are now reset between games.
-Fixed bug where player would have pipebombs in inventory but would not be able to throw them.
-Fixed problem in Protect Tha Pimp where a player would respawn at the beginning of a round in observer mode.
-DLC - Always display name of level server has selected, even if client does not have that level downloaded.