I'm really hoping for Muppet Movie Ride revival. Probably my favorite unused ride concept...
It's absolutely mine.
I know I still have it somewhere, at least I hope I do, but when I was a pre-teen I used to write Disney a lot to ask for park maps, etc. (when they used to send such things out) and one very nice person I actually called one day sent me a document that now I think must have been a shareholder newsletter or something (at the time all I know is that it felt very insider). It detailed the rides and attractions coming to WDW in the next few years (and this was 90, 91). It talked about the rides Mr. Tracy was supposed to feature in, a bunch of other stuff, and, of course, the Muppet Movie Ride.
So I've known about this ride for a VERY long time, and it would really be a dream come true to finally see it. As we were talking about in a recent Muppets thread, the Muppets are the most perfect candidates for a dark ride, ever. They are already 3-dimensional, constructed objects. In most rides, they are trying to replicate 2-D animated characters, or real-life humans (which is why I think probably the best looking animatronics of late have been Pixar-related, as they are already 3-D).
So you have these characters that are already made of felt and cloth, they just need the inner animatronic guts to make them life-like. Plus, they just really need moving limbs, head, basic mouth - the eyes don't need to move, which is often the big give-away of an animatronic's realism (at least for me).
Basically, they are already puppets - they just need them electronically controlled instead of human, and we'd see Muppets just like we know and love "alive".
I'd give up any NextGen stuff for that, let me tell ya...It would be magnificent.