Halo 6 is called Halo Infinite, Microsoft revealed at E3 2018. At least, we assume Halo Infinite and Halo 6 are one and the same. Microsoft confirmed the next big Halo game, and the continuation of Master Chief's story, is called Halo Infinite. You can watch the trailer above.
We don't know much about Halo Infinite, only that it's "powered by the SlipSpace engine." The trailer shows a large environment, pointing toward the possibility of an open world or at least large environments with more exploration than Halos past. And the trailer description confirms Halo Infinite is coming to Windows 10 PC as well as Xbox.
What is Halo Infinite's release date?
The reveal doesn't give us any indication. So that means it's unlikely Halo Infinite is out this year.
If we look back over Halo's history, every new game has been announced at least a year ahead of release, usually with a big trailer at E3. The Halo games also consistently come out in the fall, usually September or November.
If Microsoft continues to follow that pattern, the most likely Halo 6 release date is around November 2019.
Will Halo Infinite be on PC?
Will Master Chief be the star of Halo Infinite?
Again, yes, as indicated by the trailer and Phil Spencer at Microsoft's E3 2018 press conference.
What else do we know about Halo Infinite?
What we assumed would be called Halo 6 is now Halo Infinite. Other than the large environment showed in the trailer, and Master Chief being present, we're mostly in the dark about this sequel.
The end of Halo 5 seemingly sets up a rampant Cortana as the villain of this next game, and years ago 343 talked about Halo 4 as the start of a new "Reclaimer trilogy" that will presumably cover Halo 6. The story of Halo Wars 2 will also have some impact on the events of Halo 6, though it's unknown if there will be any real character crossover between the two. Halo 5's legendary ending also gives away that another Halo ring installation will come into play, next time around.
What about Halo 5's modes, like Warzone, and features, like the Spartan movement abilities? We won't have those answers until we see Halo 6, but it's hard to imagine 343 peeling back everything it's added to Halo to return to the slower pace of the older games. But that doesn't mean we'll never see a classic Halo experience on PC. Microsoft has definitely been paying attention to the popularity of Halo Online mod ElDewrito, and even Xbox boss Phil Spencer highlighted this quote from a Halo blog update: "As we look ahead, we’re very excited about the prospects of an official classic Halo experience making its way to PC and we hope to be able to partner with the ElDewrito team and broader mod and content creation community."
Master Chief Collection on PC? It could happen.