Not confirmed and I didn't ask. Personally, I hope Rockstar commits to porting every single product they release going forward to PC. They've been pretty good with most everything they make but stuff like the original RDR did slip through the cracks.
Bish already approved.
So I spoke to an insider at Rockstar who confirmed that Rockstar is indeed developing a sequel to Red Dead Redemption for PS4/Xbox One.
Don't have a lot of concrete details but expect co-op to be integrated and focused on.
Excited as fuck? ☑
Edit: Bish approved.