Vengeance includes four new Multiplayer maps (Cove, Detour, Rush, Uplink), the new Zombies adventure "Buried," and a new bonus Zombies weapon, the Ray Gun Mark II. Vengeance arrives July 2nd on Xbox LIVE
So here you have the new trailer
"The title has multiple classes and a four-player co-op mode. Classes each have their own primary ability - the Sunflower is a healer, for example. Classes shown include the Chomper, Cactus, Peashooter, and Sunflower. Boss enemies shown included disco zombie and a Gargantuar." - IGN