Though there were rumors of Tales of Xillia for the PS3 coming out this August in Japan, the Tales of Festival 2011 confirms that the game will be coming out this September in Japan. The game will also have a collaboration with anime Star Driver in the form of DLC.
The confirmed release date is September 8, 2011 for the price of 8,379 Yen (around $103). Pre-orders for the game will begin on May 30. The game will supposedly have DLC costumes for the characters from the anime Star Driver.
This info is from various Tweets of people in Japan who went to the ToF2011. All of their posts match up, so it's safe to assume the information is legit.