Back to the Future is a platinum theme for a good pin, that's for sure.
I agree with the people that say JJP should do this, and not Stern. With Stern, chances are just too big for it to become another Star Wars. With which I'm saying: a pretty good game, but not the best when it comes to theme immersion. BTTF needs awesome theme immersion.
IMHO, a new BTTF pin should not just have the logo slapped on it as many times as possible and the main theme playing all day long. Instead, it should make the player feel like he's experiencing an adventure *inside* the BTTF world, with all the appropriate bells, whistles, sights and sounds that come with that. Attention to detail in every aspect is key. To me, JJP has the best cards to pull this off.