Just a bit of curious info I found:
https://www.joystiq.com/2011/10/06/rockstar-red-dead-redemption-on-pc-isnt-happening-not-viable/
Fairly recently, when Rockstar confirmed that Red Dead Redemption isn’t coming for PC, they DID say this:
By “Grand Theft Auto titles” I’m positive they’re including GTA V, if not all future GTAs, as this quote was done less than a month ago, and although GTA V wasn’t announced yet I’m sure they wouldn’t have phrased it like that if it wasn’t coming to PC as well.