...a third upcoming test being the delayed flight of Boeing's X-51 WaveRider, now bumped to late May. The X-51's hydrocarbon scramjet technology is being considered for the basis of AFRL's Rapid Identification and Prosecution of Targets in Denied Environments (Riptide) effort.
Once again from
Popular Mechanics:
Hypersonic Cruise Missile: America's New Global Strike Weapon.
I/C