Well as Microsoft continue their xbox windows store unification there are a few games already over on the PC ( Gears of War, Quantum Break etc..). The most recent announced is Forza 6:apex.


The windows 10 store is still a bit iffy and the game has no career, no multiplayer, no wheel support, only 60 cars. (Think of it like GT prologue)
However, it's going to be free, and it's a start that turn10 have been wanting to develop for PC for a while.
"Turn 10 also confirmed to IGN that future Forza Motorsport games would be developed concurrently for PC and Xbox One."