Halo 4 is not coming to the PC. A Microsoft representative told The Penny Arcade Report that though the company is seeking new ways to boost the popularity of the series, bringing 343 Industries' new shooter to the PC is not a means to this end.
Microsoft ported Halo: Combat Evolved and Halo 2 to the PC, but all subsequent entries in the series have arrived only for consoles.
Halo 4 launched worldwide today exclusively for Xbox 360. The game is a direct sequel to 2007's Halo 3 and is the first numbered entry in the series developed outside of Bungie Studios. It is the first installment in the Reclaimer Trilogy, which will span Halo 5 and Halo 6.
Post From: http://www.gamespot.com