Each iteration has come to the PC after a period (generally between 6-8 months). While Rockstar are keeping quiet on whether GTA V will be ported over, it does seem rather likely.
Recently there was a job advertisement on the Rockstar Leeds website, looking for a programmer who would assist in bringing the latest titles to PC.
Why GTA V on the PC is likely
http://top-g4mes.blogspot.com/2013/07/why-gta-v-on-pc-is-likely.html
Why GTA V on the PC is likely, Pada: 1:29 AM