Went with my wife and son this AM to see this guy's maiden. It looks like a bat wing. That wing is huge!!!

On a side note, the chase F-16 got really close to the F-35 on takeoff, at one point I thought it was going to be hit by the engine wash and kaboom!! Wonder if the chase pilot was trying to get a closer look at a freakin skin rivet! Anyway........could have been the perspective of where I was standing.

(not my picture, F-35C + F-18 Chase)