IMO this is a very clever attempt at faking a UFO sighting.
I zoomed in on the video, more importantly on the final third where I suspected the movements may have been slightly off, and they are.
UFO's appearing from the dark side - check
Clearly insane scale (these UFO's would have to be enormous) - check
Tumbling effect - check
Lightning speed - check
Typical - check check check
EDIT: I say very clever, what do I know? This could have been thrown together in 5 minutes for all I know!

edit on 15/1/13 by angryhulk
because: (no reason given)