UPDATE: Horizon Hobby has now told me that backorders of the Scout's upper blades are starting to ship. Recognizing how bad the situation was, Horizon decided that, instead of using the standard shipping method (literally by ship across the ocean), they needed to air freight them over from China.
This decision was an expensive one to make, but better to lose some margin on the blades than lose sales. Props to them for making the tough call. We should see some blades shipping in sometime in the next two weeks, depending on where we are on the backorder list.