In an interview with 1UP, co-producers Shinji Hashimoto and Yoshinori Kitase for Final Fantasy XIII spoke about the upcoming RPG. They reiterated that FFXIII will not be delayed in Japan due to the 360 version -- Square will complete the PS3 version first then port the game to the 360 during localization for America. The most cryptic statement though, is when Hashimoto is asked about Final Fantasy VII: Advent Children Complete, he replies "You can look forward to the upcoming invite-only fan event DKS3713, where we'll have a major announcement that will shock the fans in attendance."
-PS3fanboy.com