As well as all future Square-Enix projects built using in-house tech

NZone has the word :

Square Enix has gone PC. On the first day of the show, the Japanese game publisher announced that Final Fantasy XIII is coming to PlayStation 3, Xbox 360 (in Europe and North America only) and PC. During a press conference following the Microsoft event, Final Fantasy XIII Producer Yoshinori Kitase discussed the new development strategy that Square Enix has taken with its upcoming games.

Aside from the new The Last Remnant game, which is being created for Xbox 360 and PS3 using Epic Games' Unreal Engine 3 externally, all new internally-developed games from Square Enix, including Final Fantasy XIII, Final Fantasy XIII Versus, and an untitled new massively multiplayer online game, utilize the new PC-based Crystal Tools development environment. These tools allow development teams to create cross-platform games.

"The content will be the same on all platforms," said Kitase. "However, we have yet to determine how many discs will be required for the 360 version. We'll have to consider the differences between formats. Currently the game is being built on PC, where it's actually functional. We're still focusing on making it work on PS3, so it's difficult to know how long the process of taking it to 360 will take."

Thanks to the new PC development platform, Kitase added, "Now that we're developing on a PC base, the pace is going a bit faster," Kitase said. "We haven't introduced new footage of the game, but we should be able to show something new in the near future."

Square Enix showed the beautiful pre-rendered trailer for Final Fantasy XIII at the end of the Microsoft press conference. The publisher has a big event scheduled for Tokyo next month where the first new information will be revealed on all Final Fantasy titles. Previously, the publisher released its online game, Final Fantasy XII, on Xbox 360 and PC. 

Source.

Update : Shacknews confirms that the game isn't confirmed, atleast not yet :

"Much like Capcom's MT Framework technology, Square's PC-based Crystal Tools engine lets the company easily develop for multiple platforms using the same toolset.

"[Final Fantasy XIII] is being built on PC, where it's actually functional," producer Yoshinori Kitase said Square Enix's E3 press conference, according to Nvidia's Nzone. "We're still focusing on making it work on PS3, so it's difficult to know how long the process of taking it to 360 will take."

Though the console editions of FF13 can run on Square's PC development units, this does not confirm that the title will be released for PC, especially as a full-fledged PC version would require additional testing and texture work to ensure compatibility across a broad range of non-standardized PC hardware.

The additional challenges of a full-fledged PC port are familiar to Capcom. Though titles such as Lost Planet and Devil May Cry 4 were developed using the PC-based MT Framework tools, the respective PC releases trailed those of the console editions.

Furthermore, not all of Capcom's MT Framework titles have been released on the PC, with Dead Rising continuing to stay an Xbox 360 exclusive.

Certainly, Square Enix's comments suggest that a PC release of Final Fantasy XIII is possible, especially given that Square's history of bringing Final Fantasy VII, VIII and XI to the PC, along with the recent revelation that the Unreal Engine 3-powered RPG The Last Remnant is now slated to arrive on both consoles and PC."