As it was told , there's no way of knowing until the official release .
If you do wish to know as soon as possible i would recomend subscribing to the article regarding it in the Rockstar support page .
However , there have been a few speculations from the gaming community as to what could be the requirements for the PC version of GTA V .
-- Can not stress enough that these are just speculations ! --
Here are those that most believe to be what to expect .
(recommended)
INTEL CPU - Core i5-2500T 2.3GHz
Nvidia GPU -GeForce GTX 480
or
AMD CPU - Phenom II X4 975
AMD GPU - Radeon HD 6970
and
Ram - 6GB
OS - Windows 7 . 64bits
Direct X - DX 11
HDD Space - 20GB (at least)
(bare minimmum)
INTEL CPU - Core 2 Duo E8200 2.66GHz
Nvidia GPU - GeForce GT 530
or
AMD CPU - Phenom II X2 545
AMD GPU - Radeon HD 6570 1GB DDR3
and
Ram - 4GB
OS - Windows 7 . 64bits
Direct X - DX 11
HDD Space - 20GB (at least)
Hope that was of some help , nontheless don't get ahead of yourself as the are just speculations .
Check the official Rockstar website so as to keep updated about this information.
Here are some links that might be of some aid to you :
http://www.game-debate.com/games/index.php?g_id=1308&ga...
- so you can debate and specualte with others about the game
https://support.rockstargames.com/hc/communities/public...
- so you can keep yourself updated to the official information
Cheers .