That's an interesting one... The tail kind of resembles a Hornet, but that's about where the resemblance ends.
I was sort of thinking Tacit Blue, but the Have Blue mockup looks a bit closer to me...
sitelife.aviationweek.com...
Perhaps a variant on that program? I would say unmanned for sure though.
Also, remember that the tarp could also disguise the actual shape of the item underneath... Think how Detroit always hides their new bodywork under
louvres and tarps in road test spy pics...
Good find! I'm sure some DARPA guy out there reading this is kind of peeved...