Lockheed's new mystery drone

My colleague Zach Rosenberg found this interesting satellite image of Lockheed Martin's facility at Plant 42 in Palmdale, California. It looks a lot like a RQ-170, but bigger... in fact, the shape--from what we can make out--looks a lot like the P.420. But who knows? It's not like they're going to tell us what it is...

Here is where Zach found this: http://osgeoint.blogspot.co.uk/2012/06/us-lm-skunk-works-unknown-uav.html

Here is a Lockheed patent for an aircraft with a remarkably similar planform:http://www.ptodirect.com/Results/Patents?query=PN/D382851

So it is the P.420? You be the judge...