This was originally in the console sectionEurogamer
Whether it turns out to be a Vita game or another mini series of live action,i don't know,the latter seems more probable right now if you read the EG article
Text on the image mentions "Ubisoft Digital Arts", a section of the company that previously worked on live-action Assassin's Creed 2 tie-in AC: Lineage.
EDIT:it's a PSV title
A second image of Assassin's Creed: Rising Phoenix has appeared online, along with a PS Vita listing from Spanish online retailer XtraLife.es