Seems that the leak of that alpha bulid of Assassin's Creed Unity has prompted the devs to release a very short sneak peak.
Gorgeous graphics but there is no indication that it's in-game. It could be running on their new Snowdrop Engine developed by Massive for Ubi, which means these visuals could be accurate.
Anyways the setting is clearly Paris and it will be out this year. I expect more info around E3.