The Pentagon tested a hypersonic vehicle that can strike a target anywhere in the world in an hour. While the Pentagon did not release the actual speed of the vehicle, a hypersonic vehicle by definition would be capable of speeds in excess of Mach 5. The new weapon is maneuverable unlike a ballistic missile meaning its flight path can be changed. I don't think the announcement of this test is no coincidence. Increased tensions with Iran makes this test especially important. Washington may hope this gives them the leverage to convince Ahmadinejad to back down.
AFP: Pentagon successfully tests hypersonic flying bomb