How the I think the UI will be Divided:
​Campaign:
New Solo Game
Load Game
Co-Op Campaign
Options
Arena:
Matchmaking
Team Slayer
Team Objective
CTF
Breakout
Team Snipers
Team Doubles
SWAT
Halo Championship Series
Social Slayer
Social Rotational
Custom Games
Forge
Options
Warzone:
Warzone with AI
Warzone without AI
Options