I saw an article yesterday where Kraft was yammering on about Tebow. Mentioned "spirituality" a lot. Since he's the owner, this may have been a simple conversation between Kraft(who liked the kid's spirituality), McD(who picked him in the first round) and BB(who figures he can turn anybody into an asset). With BB's bigass ego and McD/Kraft saying "Yeah, let's give him a chance!!", you get Tebow on the Pats.
I think it's still him being used as a hybrid FB/TE going in motion and getting in space. And, just to keep the other team off-balance, he takes a snap/throws a pass every now and then(much to Pussyboy Brady's dismay).