Here are some stories about it:
It seems his main mission is to raise HUGE cash for cancer. The second mission is to prove that at 37 he IS the fucking MAN!.
He will probably ride for Astana and with Levi and Alberto on the team, maybe Hincapie will make a jump who knows, but it is likely to be one of the strongest teams ever. Shit even if Lance were to suck ass he'd still rake in big cash for the sponser, teams, Tour and cancer. It is a no lose situation.