Red Dead Redemption 2 was released last Friday and has already sold a billionty* copies. It's also seen stock prices at Take-Two rise. So, why wouldn't Rockstar release the game on PC and make a load more money? It might make those clamouring for a PC release of the original sit down, too, which would be nice.
As reported by Rockstar Intel, the iOS and Android companion app, which allows you to see certain stats and all that whilst playing the game, hints at a PC port of the game. Someone by the name of BlackScout did some digging around in the code of said app and it mentions things that I don't understand like 'PARAM_companionAutoConnectIpPC,' and 'CommandIsPcVersion(void) 000000000166A12C.'
Oculus is also mentioned in the code, which could mean this mystical PC version also has virtual reality support. All rumour at this point, obviously, but Grand Theft Auto V did eventually come to PC, so seeing Red Dead Redemption 2 pop up on Steam isn't a giant stretch.
*We can't confirm or deny if it has in fact sold a billionty copies. But it has sold a lot. So… yeah.