New Campaign of course but i have to ask how many people are allowed to play at once. 4 like before or is it changed. Also do you still have to get armor by beating campaign and that sort of stuff like in Halo 3 or is it just given to you.

No one knows for sure yet, but I would guess it will be 4-player co-op campaign again.

Good I wish to beat Campaign in the first day on Legendary as I did for the others..

The faster you get the armor the better.

As well people are saying armor comes with as you would say in MW2 "Perks" just little things that make them better or worse at some thing like running or armor is tis true or a myth.