[Halo 4 Spartan Armor Ideas]

I don't think you should be able to change the armor in Campaign, but in Multiplayer, they should have more customization abilities than in Reach. They should treat Reach like a customization BETA and add many, many more things in the armory.

[Halo 4 Storyline]

ok in the trailer for halo 4, the master chief wakes up to the frigate exploding. he gets cortana and uses his jet pack to get out there ( woah hold up, when did chief have a jetpacK) he flies through the ship and reachs the hull and then it shows he is facing a massive structure which is weird because at the end of halo 3 it showed a large planet, instead it shows a forrunner structure

The ads for halo are mainly symbolic. It's just telling us that he might GET a jetpack in the game. And it never said how long he was out, so some drifting of the ship is bound to occur. And also, What if the "ship" is just the other side of the planet we saw in H3?

[Battle Rifle or D.M.R?]

If 343i is in any way intelligent, they would try to move Halo 4 as close to Halo 3 and as far from Reach as possible, otherwise they are going to be majorly flamed. So much that they might want to abandon Halo as well.