We might as well have to wait and see I guess. :P
Full list of changes from Rising Star Games' blog:
Ranked Match Filtering: one of the most requested additions; players may now set conditions for their opponent’s connection. When a player who doesn’t meet the standby conditions tries to enter the Ranked match, a warning message will be displayed and the match cancelled. Improved Filtering: filtering functionality in general is dramatically improved. Previously, certain connection data was insufficiently filtered and the player had a chance of connecting to opponents with poor connection quality. Now, more aggressive filtering should ensure that players are only matched with opponents who meet their filter settings. Improved Connection Antenna: the computation behind the players’ connection antenna, the meter indicating the quality of a player’s connection, has been improved, resulting in a more accurate and consistent measurement. Temporarily Saved Custom Match Settings: players may continue searching for opponents with the same settings as long as the player remains in the PLAYER MATCH/RANKED MATCH menu. Character-specific Bug Fixes: NESTS-Style Kyo and Iori with the Power of Flames no longer become unresponsive under certain circumstances. Additional refinements, fixes, and more!
SOURCE: http://www.risingstargames.com/blog/the-king-of-fighters-xiii-update-released-on-psn-coming-soon-to-xbox-live.html
UPDATE! Patch is now released for the American version!