Alright, so we don’t really know what game types will be in the game until we open that game case and pop H4 into our disc drives. BUT what game types would you like to see in H4? Here are what I think should be in H4!
Standard Slayer: Here would be your classic vanilla game play, with all your standard noobiness!
Evolved Slayer: This would be closer to The Arena in Halo: Reach.
Team SWAT: SWAT is a MUST considering it is the BEST game type obviously, I would like to see “SWAT DMR’s” “SWAT BR’s” and “SWAT Carbine’s”.
Team Snipers: Halo matchmaking just wouldn’t be the same if there was no Snipers game type am I right? 
Living Dead: It’s a good way to take out anger issues, but a good way to keep children out of the more serious game types. ;D
Here are some game types that will without a doubt be in H4 because they are classic game types.
Team Objective
Rumble Pit
Double Team
Big Team
MultiTeam
Game Types that we probably get straight out of the box.
MLG (Is a MUST)
Action Sack (mostly community made maps/game types)
GriffBall (I know this is a confirmed game type, but if I had to guess they will wait for multiple community made arenas.
Game Types I WANT
MLG 2v2
This one doesn’t have to be MLG but I would LOVE a 1v1 game type, it doesn’t even have to give experience, just a good practice.
Now this last one… I have put a lot of thought into, and after a lot of Halo: Reach BETA Testing, I think Halo 4 needs some Octagon playlists! Let me explain
1v1 Octagon match ups would be just practice, no rank, no exp.
2v2 Octagon would be ranked
4v4(team) Octagon would be amazing, bigger Octagon maps, maybe even multilayered Octagons(yes they exist and they are very effective)
and of course a FFA OCTAGON!!! These would be amazing… Maybe they could ALL just be… More of “practice” matchmaking then anything, but Octagon playlist could even have their own rank/exp system like The Arena did.
Alright guys go ahead and post what you would like to see in Halo 4 or what you think of my ideas! 
One last pic of epicosity! http://i47.tinypic.com/2d75uft.jpg