Infinity Ward has detailed the three Rigs which will be on offer. The Warfighter is designed for a mid-range assault style player. This Rig will get fast kills using the Claw, Combat Focus, and Overdrive Payloads.
The Merc is focused on heavy defense and suppressing fire with Payloads such as the heavy beam weapon Steel Dragon, and the Bull Charge with an armored riot shield.
The Synaptic is a C6 Class remote-operated droid which is all about speed and close combat fighting. One of its Payloads allows you to rewind your position and replenish health and ammo.
Mission Teams are a new feature whereby you gain team ranks by completing missions while enlisted in a team. Each team has a commander which will deliver missions, commenting on your success or failure. Ranking up be completing missions will earn you rewards like calling cards, emblems, and Rig cosmetics.
Two of the four Mission Teams will be available in the beta. The JTF Wolverines are all about aggressive combat, while the Orion Initiative favors strategy and objective based missions.