Well, to a point, anyway. This is more of a clarification than anything else.
Not long after the E3 2008 announcement that Final Fantasy XIII would be headed to the Xbox 360, director Motomu Toriyama said very clearly- "We're making the PS3 version first, and then porting to the 360 later." But according to recent evidence gleaned by Videogamer.com , that's not entirely accurate. According to producer Yoshinori Kitase, the "basic engine work" is being done on the PS3 and 360 "simultaneously." Now, FFXIII is slated to release only for the PS3 in Japan, and then for both the PS3 and 360 at a later date in North America and Europe. But based on Toriyama's comments, many believed this translated to unnecessary waiting for PS3 owners, just because Square-Enix wanted a simultaneous multiplatform launch. However, with Kitase's statement, it seems clear that the team really is working on at least some aspect of the project simultaneously between the PS3 and 360 versions. Here's the quote in question:
"When it comes to the basic engine it's likely we are going to keep them on the go simultaneously. But the finishing touches, the details, the PS3 version will be completed first, then we will move on to 360."
As for those finishing touches, Kitase confirmed they haven't completed them for the PS3 version yet, so of course, they haven't started that part for the 360 version. Maybe this will serve to settle some of the Square-Enix hate floating around out there; it'd be erroneous to believe that the developers are only working on the PS3 version right now. It'd be irritating if they were, because then they'd put it aside to gather dust when it's finished – rather than letting us have it – to work on the 360 version for a simultaneous launch. But that's not really the case.
Related Game(s): Final Fantasy XIII