Valiant Saga: Final Fantasy, fake or not?

Recently an image has been circulating the web about a new Square Enix title called Valiant Saga: Final Fantasy that will be released on PlayStation 3 and Xbox 360. The image shows that the game is developed by Eidos Montreal. There's also a Twitter account active with the default avatar.

Valiant Saga: Final Fantasy ?

Please note that this is no official announcement and is most likely a fake. Or not?