They had a pole on XBL. They were selling avatar shirts. I think they said "Let him die." and "Let him live." Something like that, basically. So whichever shirt sold more is his fate. They didn't tell anyone though because they want it to be a surprise.
that thing you were shooting I think was the uvula the thing you have at the back of the throat if kept doing the worm should vomit but don't know if it should that in the game
I don't think the Riftworm is a giant Rockworm. It has a different mouth, no eyes like Rockies, Rockies lived any way, the Riftworm was ancient and awakened by the LMBomb, so...oh yeah, and there's two other Riftworms besides this one. =O