Ok guys, this one is strictly filed under the "rumour" section so take it with a pinch of salt, but the SAME guy (an IGN insider source) who first broke news of the Xbox 360 version of Virtua Fighter 5, is now reporting that Namco is currently developing both PS3 and Xbox 360 versions of Tekken 6, scheduled for release this winter. When asked for confirmation, Namco were unavailable for comment, but following titles like Assassin's Creed and many other previously PS3-only titles' now going multi-platform, don't be too surprised if Namco's latest fighter ends up on Xbox 360 also.
News source:
computerandvideogames.com