AMD held a launch event in South Korea for their new R5 CPUs and showed off some upcoming games that are heading to PC. One of those games shown off happened to be artwork from Halo 3. This has led some to wonder if Microsoft is releasing the game on PC and AMD let it slip.
If this is the case, it’s unknown if this will be a remastered/anniversary edition as there have been reports of Microsoft planning on announcing a Halo 3 Anniversary edition at E3 2017.
Please keep in mind this is still a rumor and nothing has been confirmed by Microsoft.