BioWare's announced the next piece of download content to his to Cerberus network for Mass Effect 2. This one will let you control a Hammerhead tank which hovers over the battlefield.
The Firewalker DLC is expected in March and will be available free to Cerberus network users, the download content itself includes five missions based on the Hammerhead tank which "hovers over the battlefield at up to 120 kilometers per hour and features a guided missile system ensuring accuracy even during aggressive maneuvering."