Nah, he's probably already dead, but will appear as holograms for instruction.
Personally I'd much prefer it if he turned. He was never really trained, and, like Anakin, was taken on a journey at the direct instruction of other older force users and thereby caught in a track and a path of action that couldn't be avoided - one that saw him the harbinger of his father's death. He got adventure, but at what cost? At minimum he should be pretty jaded about the force and jedi, but it would be quite interesting if instead he began to see the humanity in his father as Darth Vader, and started to waffle on whether there's really a good side in the force. Maybe he trains the next sith, thinking that perhaps he can reform the empire into a better entity. Sure, Palpatine was a bad guy, but the Jedi were partly to blame for the way Palpatine was able to trap Anakin.
Alternately, he helped destroy the empire, things broke apart and became unmanageable, and he found that it had really bad results, which he had no power to control or effect - finding himself caught in political intrigue and machinations he had no mind or desire for, and thus left adrift watching the consequences of his actions from afar.
Regardless, I want to see Luke turn, Obi-wan again shown to be a lousy jedi teacher, and someone from Luke's family coming after him, like he did for his father.
But this is all wild conjecture, I'm avoiding supposedly "real" spoilers.