Here's the official changelog:
The download brings a number of enhancements for the game, and will improve the following:
* The end-match crash in Manager Mode and Exhibition Match.
* The Manager Mode crash when using Peterborough Club.
* Teams in Manager Mode that were appearing in the incorrect leagues. Note: This will not work for Manager Mode saves that you have in progress, only new ones that you start after installing the patch.
* The Manager Mode in-game scoreboard location when in widescreen mode and using a league other than England.
* The Manager Mode in-game scoreboard location when Olympique Lyonnais are used.
* The weather pattern randomizer in Manager Mode.
* Two users playing on the same team if you enter the online mode with the mouse.
* Online Head to Head matches where the in-game scoreboard location was sometimes too low on the screen.
* Users being able to control the opponent CPU with a second controller after backing out of a Ranked Online match.
* Users who did not receive a DNF% on the Head to Head Leaderboards when pressing ALT + F4.
* Highlight replays video stuttering.
* NIS (Non-Interactive Sequence) stuttering.
* Improvement for keyboard users who were not able to access the in-game Controller Settings.
* A work around for video stuttering on ATI video cards (until a new driver is released).
* Correction to Lincoln City kit sponsors.
* Correction to Zenit St. Petersburg third kit.
* Correction to Montpellier kit sponsors.
So far, the only thing I've noticed is two hard crashes while playing, since I installed the patch. The lag isn't fixed - a less than fantastic start for the new patch.