from the new info on halo 4 concerning unlcockables i think its very safe to say that it wont be a case of unlocking the sniper rifle, BR, rocket launcher for loadouts but rather more like perks such as faster sprint etc I believe that it will be like that and you still have to fight for the weapons on the map. Also it would be cool if the perks gave cosmetic changes to the armour.
I am very pumped for this game now it looks amazing 
Do you agree with my theory if not how do you think it will work in the game?