It seems there are certain franchises and developers that are just made for each other. Either they share a common influence or the developer has clearly been working the same area or maybe you just think their approach to games is a perfect for another franchise.
So which pairings would you like to see?
For me I'd love Frictional to work on an X-Files game. A first person investigate em that sees you slowly progress from investigating a murder to finding the threads of a government conspiracy. The potential for insanity effects whilst playing an ultra paranoid conspiracy nut are immense and there are plenty of bogey men (both humanoid and the other kind) in the series to provide the chases they do so well. Most of all though I want a real detective game, where you have to investigate the scene in the Amnesia/Penumbra style dusting for prints and prying up floor boards not simply waiting to find a hotspot like LA Noire. You could even perform autopsies and play pathologist as you look for causes of death and end up finding a metal plate behind their heart or something. Right now I think Frictional are the only people really trying new things in first person games and that is really kind of sad.