What looks like a screenshot of an Assassin's Creed project has appeared online via All Games Beta.

The image gives almost nothing away, but given that Ubisoft Digital Arts (the branding on the bottom left) is the company's "cinema creation studio", it could well be a film-related project rather than a gaming one. Assassin's Creed III: Liberation sold well on PS Vita, though, so another Vita game is far from impossible.
The next console entry in the series, Assassin's Creed IV: Black Flag was announced this week, and we've got oodles of coverage of it. There's also an Assassin's Creed movie in production with Michael Fassbender.