Roamy here. From War News Updates, the X-47B was seen flying around Edwards AFB.
The X-47B is a carrier-based, long range, unmanned combat aerial vehicle. I read on Wikipedia (so take it with a grain of salt) that it’s to be armed with 2 JDAMs. The flight today was 29 minutes with a top altitude of 5,000 ft. More flights are planned at Edwards, with sea trials in 2013.