Crysis was available for the Onlive console will Crysis2 be as well? If so why hasn't it been mentioned?

We do not know as of yet.

I think onlive manages it's own games. I don't think crytek has a say in which games are offered. I would ask onlive if they plan to host it.

EA has the final say. Onlive can't host the games without the companies permission because EA and Crytek need to get the share of profits made from the users buying the title off of onlive.