There is no official claim that GTA V will be released for the PC. NVIDIA did accidentally "confirm" it, but they state that it was an accident, and it is an honest mistake considering that every other GTA except for Vice City Stories & Chinatown Wars (duh) has been on PC. And yes, there are many petitions for bringing GTA V to PC (with A LOT of signatures), but there are many reasons as to why it wouldn't. One being more piracy, obviously (stupid since it was pirated on consoles anyways...). The others being money, which I think it illogical (but they've been doing this since GTA III). There are many more. Personally, I believe it will be released for PC without a doubt. But Rockstar didn't release Red Dead Redemption and Midnight Club 3 for PC which is very disappointing. And GTA IV was a horrible port to PC, it was released after the console release of GTA IV and I would give Rockstar even more time to port GTA V so that we don't have to deal with a piece of **** start port like GTA IV, and Saints Row II, III, and IV (for example)... a lot of people assume that the console release is just a timed exclusive to get people to buy consoles, the game, and maybe even buy the game a 2nd time for PC when (if) it's released for a much better experience (graphics, mods, multiplayer/online, features, tweaks, scripts, etc.)... maybe even next generation consoles if those get released for GTA V to be on them... That being said it was released for console today (Sept 17th, 2013) just to let you know. I'd give Rockstar a lot of time to port GTA V to PC considering how disappointing GTA IV was as a port, and I'd love to start off playing a game that isn't a chore. All in all, I believe that it will be released for PC, I just hope that it's a good port... And by the way, Rockstar has NEVER stated that GTA V will not be for the PC... there is not much reason as to why they would not officially state that, so they either have a plan or are still thinking it over. And that whole Amazon thing is another reason as to why GTA V will be coming to PC, though it's not as a reliable source as Rockstar themselves. It is true that every game is made on PC, but that's not a good reason at all considering we got console exclusives... so... And from what I've seen, the footage you are able to see on the Rockstar Youtube page is a lot better than what is actually on consoles right now... granted it's always like that to just make it look better and to overhype things, but it is an very unrealistic difference; even if they were planning on releasing the game for next gen consoles. Not sure what I'm trying to make that mean, but I guess I'm just trying holding onto more strange hope, haha. Though what disappointed me is the fact that (not sure if this is true) I heard that Microsoft paid $75 million to stop GTA IV from being a PS3 exclusive (like, really... really upset with that), but there is no need to worry considering that GTA V is on the xBox 360 which is made by Microsoft :) so chances are that it will eventually be on PC. The difference between the console and PC releases for GTA are always far from each other, around 7-8 months (been like this since GTA III), so we've still got time to hope. I'd give them a year... GTA IV was for the PC was released around 7-8 months after the console release and the port was disappointing. And "pirate-proof" is just an unrealistic term... that won't work well, and it surely didn't work well for GTA IV & LCS... that's for sure.
The simple answer? Everything points to "yes"... it's just a matter of "when", and I'd hope it's not rushed so that we get a good port... if they don't have some plan already, which I'm sure they do... and I wouldn't bother asking console gamers this question, because the answer will most likely be "haha no, rokstur nos dat pc sux nd consol rulez" (no offense, but that's all I've gotten so far).
So... yes, GTA V is definitely going to be released for PC.