Funny part is he's not even in the premier league. He's running the Dunlop series which is their development cars. Only 6 races throughout the season, and they're all short.
He's recently complained on twitter, now removed, about his dislike in the series.
A few retired GP riders have recently shared their opinions that it is very likely Stoner attempts a comeback to GP. He's still young and the talent will surely still be there. I think Pedrosa's spot will become vacant soon if he doesn't win more, although last year he was very strong in the second half of the season.
There's also Suzuki in 2015.
Rumour has it that BMW might be making a run at MotoGP as well...