The service, which is available on PC, will run you $10 a month now (after a recent price hike), and it will grant you access to a plethora of games, including the entirety of the MCC. If you aren't interested in buying the MCC all at once, or even Halo 4 by itself, there is one more avenue available to you: Xbox Game Pass.
However, as PC fanatics, we certainly won't say no to some extra graphical options and tweaks. Halo 4 was never an ugly-looking game, and even by today's standards it holds up relatively well. Microsoft is promising an "optimized" experience with Halo 4's PC port, though we're not entirely sure what that will entail for the time being. Halo 4 will officially arrive on PC as a part of Halo: The Master Chief Collection, on November 17. This could be useful if you've already played through some of the games on console (or PC, in the case of Halo 1 and 2). You can buy the individual games a la carte at $10 a pop (with ODST being the sole exception at $5) if you'd like. It's worth noting that, though Halo 4 is arriving in the MCC, the way 343 Industries has structured the bundle is not particularly rigid. If you haven't delved into the franchise on PC yet, that gives you a solid eight days to snag the rest of the games and play them through. The game arrives on PC as part of the Master Chief Collection come November 17, which is just over a week away. Soon, the much-lauded Halo 4 will be joining their ranks. As of writing, Halo Reach, ODST, 1, 2, and 3 are all available on PC now, often with remastered graphics and PC-optimized gameplay.
Something to look forward to: PC gamers have been waiting years to fully enjoy the Halo franchise on PC, but thanks to the ongoing efforts of developer 343 Industries, that waiting has finally started to come to an end.