Courtesy Alison Stroll, Senior Producer on Halo 4 via Twitter.

Okay, you may have seen the previous vid. However, that one clouded up the weapon noise with music. So here is the vid sans music.

The needle rifle sounds more like a machine gun needler than it did in Reach.
The Carbine sounds POWERFUL! Lots of PUNCH to it.
The Fuel Rod has a distinct “canister” sounds to it.
Needler seems faster. Plasma pistol definitely sounds more like a pistol than something futuristic.
The Plasma Sword sounds fantastic. I hear references to the Light Saber in activation as well as in a strike. I LOVE IT!
Concussion rifle has a little bit of the canister sound, mixed with shotgun. Well, that’s how I hear it anyway.
Now the Beam rifle…OMG, that sound is awesome. Futuristic to be sure.
We’ve heard wha the Gravity hammer sounds like form recent vids on Griffball, but now we get confirmation that it’s in Multiplayer as well!

Ahh yeah!!!

-Sal