Assassin's Creed: Unity was leaked last week together with Assassin's Creed: Comet.
The guys from n3rdabl3.co.uk apparently got a foto which shows an unpublished forum post of an Ubisoft-Community-Manager which contains parts of an press statement for Comet.
According to those info, the game is in development for 2 Years and will be released around November.
Mentioned Plattforms are PS360 and the Next Gens.
The protagonist is Eseosa who is the grandson of Adéwalé from Assassin's Creed: Freedom Cry. Apparently Eseosa is searching for the help of Connor from AC3.
Its a german site, but its pretty reliable and known, dont know about n3rdabl3.co.uk though.