User blog comment:Master Sima Yi/Assassinews 04-06-'12 — E3 hub/@comment-4374396-20120605020411/@comment-5503561-20120606015657

I think the face changing is because they've improved the mo-cap, and he'll actually visibly age over the course of the game. In one of the trailers when he's seen without the hood, he appears much older.