Found and am reading the first draft of BTTF II, titled simply "Number Two" and... huh.  This is why you don't let people read first drafts.  But I think it's more putting down what they want to say and not what it will actually be.  Reading that while I'm watching the special features for part II.

You know, the trailer for Part II still gets me excited, still makes me wonder what I'm gonna see, even though I've seen that movie SO many times... there's such PROMISE in that preview, gets me excited.  Maybe it's just nostalgia in overdrive but nothing else does that to me.