Guardians of the Galaxy after the second movie is released. It would be hard for this one to miss, featuring Baby Groot and Rocket Racoon, plus that soundtrack.
I agree with lpeters82's post, Scooby would also be a big hit, especially if based on the original mysteries. Put Black Knight, Capt Cutler, Miner 49er, and another couple on the playfield like Monster Bash, but with some trickery like a moving bookcase and ramp into a subway. They could even use that spinning carousel like on BM66 to squeeze in more episode sets. Lots of potential.
I'd jump on either of these pins.