TimeShift no longer a 360 Exclusive?

From Worthplay:

TimeShift is an FPS in which players control time to complete missions and defeat foes. The game will leverage first-of-its-kind gameplay abilities and functionality, and the latest graphics technology to create a unique action game experience. At a press event last night, Sierra showed off the new and improved TimeShift, ending with a video clip which revealed the PlayStation 3 logo in the closing credits. When asked, Sierra PR would neither confirm nor deny this news.