It's not completely new, you've seen Sephiroth in Dissidia
trailers before and we've told you at TGS that Cloud would be in the game. If you had any doubt, then this scan from Shonen Jump magazine should finally cast off that inkling. Because really, print makes everything official.
While the in-game image isn't the clearest image ever, it still shows off the final Dissidia
roster member, Cloud. With all characters revealed and a release in just over a month, all that's left to do now is wait to play. December 18 makes (Japanese) fanboy and fangirl's dreams come true.