If this question has already been asked then I apologize for wasting time with a redundant post. I have been wondering this for a while (or I have been living under a rock)
You’ll probably want to use the search function on Waypoint, there’s a tonne of threads about this that were locked since there’s already a large megathread dedicated to this topic.
Short answer is this, in theory it could happen one day but all of 343’s resources are currently in Halo Infinite and the live team is supporting MCC.
If Halo 5 were to come to PC it wouldn’t be anytime soon. The people power isn’t available at the moment & releasing it in the near future would also clash with Halo Infinite’s time in the spotlight.
Feel free to use this existing thread for this: