IMO with these changes, Halo 5 will be a 9+/10 game.

New maps out ASAP, new REQs, more gametypes in order of priority.
2nd most important thing is a SOCIAL GRAB BAG PLAYLIST, this has the 1st/2nd biggest impact on potential population declines in the game. TS/CTF/Stronghold, maybe even SWAT/Breakout/Snipes or in their own social playlist? I completely agree with having minimum playlists.
Make the weekend playlist 2x XP AND RP, also make it not ranked.
Add ranked Team Snipers and Doubles.
Add a post game medals screen, simple stuff.
Allow me to hear my fire team in the menus.
Remove the mindbogglingly terrible 1.5 second loading screen when I back out to the lobby/menu.
Try to make spartan companies in-game, getting so close to h2 clan system but fell short :(
Make the winning team be on top in the bottom right score counter and not the team your on, additionally organize players by team in custom games, so its RRRRBBBB instead of RBBRBRRB. No idea why this was changed and it really cant take more than a day to change this right?
Not my area but add campaign scoring/timing, at least make it inline with previous halos.
Please don't mess up file share.
Add theatre recording back, Xbox DVR 720p isn't quite cutting it.
This is a long shot but make the "oracle mode" comparable to other esport games spectator modes.
This is just my opinion but SLIGHTLY nerf AR and maybe autos in general, SLIGHTLY reduce magnetism (either wont happen but IMO it should). <--I know most people will disagree

With these changes, the game will be godly.

Submitted by iZeezbruh Xbox 720 Release Date 2015