Allah, ever skeptical, dubs it legit. It's a module intended for orbital attacks on ICBM's in flight, although one is free to dream up more awesomer applications.
From the caption of the vid at YouTube:
LOCKHEED MARTIN TEAM CONDUCTS FREE-FLIGHT HOVER TEST OF MDA'S MULTIPLE KILL VEHICLE-L, Wall Street Journal (Market Watch), Dec 4, 2008.
Lockheed Martin Corporation announced today that its team successfully conducted a free-flight hover test of the U.S. Missile Defense Agency's Multiple Kill Vehicle-L.
Conducted Dec. 2 at the National Hover Test Facility at Edwards Air Force Base, Calif., the test met all objectivesThe full-scale prototype flew at an altitude of approximately 23 feet (7 meters) for 20 seconds, maneuvering while simultaneously tracking a target. "This test demonstrated the integrated operation of the MKV-L in near-earth flight," said Rick Reginato, Multiple Kill Vehicle program director, Lockheed Martin Space Systems Company. "This represents a major step forward for the earliest operational payload designed to destroy multiple threat objects with a single missile defense interceptor."
Already Posted: DrewM tells me Dave in Texas posted this last week. Damn, missed it. I really should read this blog more often.