Truthfully, Retro is the new Rare in many ways. Retro needs to make its own IP sometime though.
I'll be more than happy if Retro branches off and makes their own IP in the near future. They've proven they release high-quality games with great precision and attention to detail. I'd love to see them do something completely new with their next game, but I'd be lying if I didn't say I want to see them release a 3D Donkey Kong game in 2-3 years.