According to DARPA updates, the test flight appeared to go well until the glide phase, when monitoring stations lost contact with the HTV-2 vehicle.
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After launching on a rocket, DARPA's Falcon Hypersonic Technology Vehicle prototype reaches suborbital space and then re-enters Earth's atmosphere at speeds of about Mach 20 (DARPA)
Falcon HTV-2 is lost during bid to become fastest ever plane -- The Guardian
U.S. loses contact with hypersonic experimental plane -- National Post
Sinking Feeling
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More News On The Military's Lost Of The Falcon HTV-2
Falcon HTV-2 is lost during bid to become fastest ever plane -- The Guardian
U.S. loses contact with hypersonic experimental plane -- National Post
Sinking Feeling
More News On The Military's Lost Of The Falcon HTV-2
Falcon HTV-2 is lost during bid to become fastest ever plane -- The Guardian
U.S. loses contact with hypersonic experimental plane -- National Post
Sinking Feeling: Pentagon’s Mach 20 Craft Drops Out of Sight -- Wall Street Journal
Contact lost: 'Hypersonic glider' capable of 13,000 mph speeds -- USA Today
The Military Just Lost ANOTHER Hypersonic Jet Over The Pacific -- Business Insider
Test of hypersonic aircraft fails over Pacific Ocean -- L.A. Times
US military loses contact with hypersonic aircraft -- AFP
Hypersonic Plane: Experimental HTV-2 Launches, Loses Contact -- ABC News
My Comment: This failure will probably kill the program.