New DLC came out yesterday, containing two new maps for multiplayer, two for escalation, plus the three special pre-order bonus characters you got one of if you pre-ordered it in the US from certain shops, or from Amazon here, plus two other characters.
Personally I'm suprised to see that one of these characters, Scattershot, transforms into a tank rather than a jet as he does in G1, though as a triple-changer he did have a gun emplacement form too, so I suppose tank is not a long shot from that.