User blog comment:Master Sima Yi/Assassinews 19-03-'14 – Two Assassin's Creeds for 2014?: Unity and Comet/@comment-24615696-20140404132132/@comment-1888015-20140407230847

It's probably concept art merged with in-game engine renditions, if it's not completely in engine.

The detail on the character looks very clarified, especially when you consider the pastel/brush-like strokes Ubi uses in their concept artworks.