The bomber, belonging to the 412th Test Wing, includes an improved middle bomb bay expanded from 15 feet to nearly 22.5 feet. That's large enough to carry a future hypersonic weapon. Hypersonic missiles travel at speeds of Mach 5 and above, giving enemy forces little time to react.
The second improvement involves carrying weapons externally. The B-1B was designed to carry nuclear-tipped Air Launched Cruise Missiles on external pylons, but doing so would have compromised the bomber's stealthy design and the Air Force never trained with them. Now the service wants to resurrect that capability, giving the bomber the ability to carry 16 missiles on six external pylons.
A B-1B can already carry 24 Joint Air to Surface Standoff Missiles (JASSM), and an upgraded B-1B could carry 40 JASSMs. Two B-1Bs launched 19 JASSM missiles against chemical weapons facilities in Syria in April 2018. In the future, just two B-1Bs could launch up to 80 missiles. The B-1 fleet could likely carry an identical number of Long Range Anti-Ship Missiles (LRASM), a new ship-killing missile based on the JASSM.
Is the potential reactivation of the external weapons pylons related to the death of the INF Treaty?
Either way, that's a whole lot of missiles - especially the LRASM version of the JASSM. Just a handful of Bones could wipe out a significant portion of the Chinese fleet - which is good because apparently we only have a handful of FMC airframes.