Many lo-pro gas blocks, including ours will fit under the Omega.
I cannot speculate on the release date of the 12.0. It was decided after SHOT that the 9.0 would follow the 7.0 first, then the 12.0. All I can say is "soon".
I think going to the 9.0 first is a good move, frankly. The increase in mid-length gas systems, as well as departments that issue Armalites, would seem to indicate a greater demand.