GTA V will more than likely be released for PC, but at a later date than the console release. There was news Rockstar was hiring a graphics programmer which led many to believe they were working on a PC port.
Here is the listing:
http://www.rockstarwatch.net/news/1299/Leeds-job-posting-hints-at-GTAV-PC-port/
I doubt too as I read the reviews on some gaming sites that says it might be release next year for PC version. There is still no official announcement from Rockstar. Most of the pc gamers are really looking forward to it.
The only thing that will be official is if it is on Rock* 's website, anything else is pure speculation and fanbased (yes some company's are big fans of Rock*)
Expect to see the game June, July, November next year