succas i had it since last thursday
new Vehicles are sweet: The Elephant, new 6 person warthog, new human flying thing( forgot what it was called) , mongoose is fun to drive ( i like playing rockets with my bros and 2 teams 2 ppl on a mongoose and each fires rockets or the spartan laser at each other first team to 20 kills wins)
Maps are cool: i like Valhalla, and the one map that is like a bridge and has the human jumper things.
weapons: spartan lazer, brute smg,Brute shotgun, assault rifle, gravity hammer, ( i have noticed that the assault rifle sounds like halo 2's smg)
They have added the "zombie" slayer game type. as well as Forge which is like a map editing thing while you battle (its really fun)