I dont really think there are any other games they could get out of him. All the games cover his entire life. You have the original 2 - Revelations. But then you also have the AC2 for the DS which takes place between certain chapters in the original 2 and shows what he got up too.

And then you have Embers ( animated movie) which shows him at the end of his life, and finally AC China which shows more of him training Shao Jun.

Personally I'd love it if Shao Jun got the full AC treatment. With a game chronicalling her childhood, her training with Ezio, and eventual return to china.