It looks like they are checking out both the, “Piasecki/Boeing X-49 SpeedHawk compound helicopter and the Sikorsky X2 coaxial helicopter,” as an interim measure toward higher performance helicopters, and they are looking at things like the Joint Heavy Lift (JHL) , such as the, “Bell Boeing QuadTiltrotor, a Sikorsky heavylift helicopter concept and the Karem/Lockheed optimum speed tiltrotor,” to carry A-400M sized, or at least larger than C-130 sized, loads.

What is really at the core of a lot of this is that since 1947, when the USAF became a separate branch of the service, and took over fixed wing aviation, they have not been well served, so they are looking toward bringing the capabilities back in house through new helicopter technologies.