I see Tebow being used as the primary QB and the QB for goal line situations.
Within 5 yards of the goal line and a 4 or 5 WR set, a Tebow run offense is theoretically impossible to stop. However, with a dedicated RB, Tebow at the goal line would probably be MORE effective as Tebow could run it up the middle for 2-3 yards, the RB could run it, Tebow could pass it, etc.
I see Newton being like a Pat White who is more of an open field run threat than a ground and pound run threat.
If Tebow is in, he'll pass all over you or run it down your throat.
If Newton is in, he'll pass it effectively, or run it by you as you break your ankle. Either way, the defense will have to defend against the run and the pass.
I could be wrong, but it just goes to show you how scary and how much potential our offense should have next season.