It has been confirmed that the PC version of GTA V will support 60 FPS and 4K resolution, though the official system requirements hasn´t been released by Rockstar yet, and I´m guessing they will post it on their Newswire sometime in January 2015. You can expect the recommended requirements to be sky high, and the recommended settings always is the 1920x1080 settings, but as all PC games, the graphic settings can be changed. My guess is that Rockstar goes all the way and test the 4K settings out on a GTX 980 and recoomend a Radeon R9 290X or some other crazy shit
I think my PC will be able to run it on Medium settings, MAX!