In the Halo 4 trailer, we noticed two new things. Master Chief has new armor and a new gun. The armor is likely Mk-VII, the latest MJOLNIR Armor. But we're still not sure what the pistol is. Below is a new image released by 343i of the new Master Chief action figure wearing the new armor and holding the new pistol (dubbed "rocket-pistol"), as well as a couple images from the trailer.