You'll only have to wait a month or so for PC version of GTA5. That's not a long time.
Actually it has classically been a 6 month wait. And this time Rockstar isn't even saying they are doing one. There is a petition with 500,000+ signatures for a PC release.
They said in an interview couple of months ago that there will be a PC version of GTA5 like there always was. But you'll have to wait couple of months. reason why they didn't announce it properly is cause they want to sell as many console copies of the game as possible, cause games for consoles are more expensive. In my opinion Rockstar has lost something that was making them awesome before and are getting to the point to being as EA is. Which is sad to say the least.
Again this will be another pathetic console port like GTA4 was, I'm pretty much sure about that (that doesn't mean game itself is bad, I want to point that out before someone says I'm dissing the game).
But yea, there will be a PC version of GTA5 100%. That is certain.
Also when ppl were asking for Red Dead Redemption for PC, Rockstar said, that PC gamers will get their fix of Rockstar games between L.A. Noire, Max Payne and GTA4 to keep them busy until GTA5 is released for PC. They said that before we even saw first screens of GTA5, right when they announced GTA5. So PC version is not in the air, it's guaranteed. No need to loose sleep over it. So I don't get why ppl are making petitions for no reason.
But we're getting off topic here.