A GamesRadar livestream with Frank O’Connor of 343 Industries touches on the possibility that Halo 5 will eventually make its way onto the PC platform. DSOGaming transcribed the following quote on the chances of a Windows port of the shooter sequel:

You know, Microsoft has made a huge commitment trying sort of… I think normalize the Windows experience across multiple platforms. You see the elements of Windows 10 are going to appear in Xbox and Cortana and stuff like that. There is plenty of chance that Halo 5 could appear on the PC. Nothing to announce at this point… you know, we developed the game on an Intel platform. It wouldn’t be the hardest thing in the world to move it to PC and take advantage of PC stuff. But nothing I announce today on this chat.