So as sick as halo 4 looks right now.. I still can't get hyped, three words..
Skill based rank
Until this is confirmed in multiple playlists I cannot bring myself to preorder the game. Granted it looks fantastic but I know without ranks I will eventually grow bored of it.
That's what happened to me with Reach. Reach didn't have a skilled based ranking system and I barley play that game no more. Went right back to Halo 3.
I hope the same don't happen to Halo 4, because the game is looking good and has potential to keep a strong population all the way up to Halo 5.