Seems we might possibly getting a PC port? Of course, some really fucking stupid ideas getting upvoted, but maybe it would be worth it to sign up for an account and suggest something...
For me, behind PC support with an actual server browser and custom map/game/gametype rotations, it would be fixing the horrendous UI/user experience.
I'm not holding my breath for anything 343 does, but if they made the MCC a play-anywhere game so that I don't have to buy it again on PC, that would be nice. Releasing classic Halo on Steam with full modding support would be nicer though, even if it means I have to buy them again.