A summary of the intelligence:
http://www.nytimes.com/2013/09/04/wo...nted=1&_r=1&hp
A post mortem of Iraq bunker busting (which was largely ineffective) lead to the development of the Massive Ordnance Penetrator (MOP) GBU-57A/B, a 30 ton bomb that can only be carried by the B2.
This is a very important interim weapon because most high value targets in North Korea and Iran are deep underground.
So America is very likely to use this weapon, which means using B2s. Firstly to get Assad's bunkers. Secondly to send a message to the world about this capability. And thirdly to see how it works in the real world.
MOP in B2:
