"U.S. Air Force researchers are pondering a project to fit the recently developed Massive Ordnance Penetrator -- a 30,000-pound bunker-busting "super bomb" -- on the B-2 stealth bomber"
So they have finally found a use for the B-2?
I have to assume that the bomb will be carried internally, and that the intended mission is too hazardous for a B-52 (or perhaps the B-52's bomb bay cannot carry this bomb, either because it is too large, or the bomb bay is divided into segments).