I'm not sure,I think they will purposely not sell a PC version a good year or so after console release to maximize console sales as much as possible.
They know if they done that PC gamers would get bored of waiting and buy it on console (if they own one)...then at a later date also buy it on PC...so they get two sales from one person,If you understand what i mean.
But then again,This might not actually not be their move..for all we know they could actually be developing GTA V for PC separately from the console version and are putting in that extra work,Which they failed to do with GTA IV for PC.
I guess we wont know until they say something!