that is not the ultimate iron man but the new suit in the new regular Iron Man title Adi Granov did the art for the first 6 issues and is still doing the covers
It looks like a combination of the Mark I and Mark II versions that Tony developed before and after taking the Extremis in the Ellis/Granov Invincible Iron Man run of the same name. The helmet looks like it has a longer shape and more angular cheekbones, as in the Mark I (whereas the Mark II helmet is more round and smooth). But the torso looks identical to the Mark II, save for the circular chest port (in both the Mark I and II, the chest port is upside-down triangular-ish).