I see from the Forge World previews for GamesDay 2012 that they are going to be releasing a new tank based on the original Land Raider.
The Typhon Heavy Siege Tank was named after the ‘Great Beast’ of Ancient Terran myth, this immense siege tank was developed by the Mechanicum alongside the Spartan, with which it shares a basic chassis design.
The Typhon’s primary armament is the massive Dreadhammer cannon, and was created in response to a request from the Primarch Peturabo, master of the Iron Warriors. He demanded a Legiones Astartes war engine that could rival the great batteries of the Imperial Crusade Army in firepower, but manoeuvre and deploy at the speed of a Space Marine force.
Very nice looking tank.