Please no more remakes, just focus on getting Azure dedis/regions, chat, abusive player/team traits and generating content for the various Halo flavours e.g. hardcore, BTB, objective, niche (grifball/action sack).
What 2014 solidified for me was I do not care about the latest game graphics, launch hype, UI changes etc. I care about the content, details, refinement and quality leading to actual enjoyment when I play the game or review/spectate/chat about a game online when not actually playing.
For 2015, Xbox One and specifically Halo I want dedis that work for my region, population that is retained in my region, a game that allows me to enjoy things solo or with mates and content that just keeps me/us coming back. The whole enchilada has to be stable from party chat and leadership to sharing content and actually playing the game.
Honestly I'd love to see a developer staff up to just generate content for the same engine and UI for 3-5 years. Forget reinventing the wheel/design/development every single game release. I'm more than happy for both campaign and multiplayer to receive this sort of process, far more than another updated game remake.