Halo 4 introduces the Mantis Mech.A single Spartan controlled battle suit that comes with a machine gun, rockets, and a nasty stomp ability to crush cars and flatten enemies. This is not to say this new addition is invincible. Players can still board and remove enemy combatants as well as shut it down using a charged plasma pistol shot. Mechs will definitely change the gameplay, but I think for the better. You can see a gameplay trailer for the Mantis as well as Ragnarok, the Halo 4 remake of Valhalla, below.
Halo 4 is coming ever closer and launches November 6th, 2012.