Sure does look like the Valkyrie, but...
The 2 bright spots, which look like jet/rocket exhaust, line up perfectly parallel with the velocity vector of the aircraft. However, there is quite a bit of of (horizontal or vertical?) separation between the contrails, suggesting that the bright spots are not the source of propulsion. Contrails coming from those bright spots would be one in front of the other, looking like a single one from this viewpoint.
You could argue that the aircraft has suddenly rolled in the time between when the photo was snapped and when the contrails formed, but I seriously doubt it... not an aircraft that large and that fast.
Apart from that, I have no idea. Certainly, never believe everything that AW&ST tells you.
