Heard a small rumour today from GW staffer....ogryns shields act as mobile aegis line type defence....4+ cover save, but they forgo their move in the subsequent phase. The weapons are a cross between grenade launchers and a mortar with specialist shells. Sounds very feasible from what i have seen of the model. He also said that the moustachiod ogryn is indeed neddog and has some interesting rules. On a par with the Kell rule with Creed.