I see three flying wing styles there. One is the GJ-11 and the other two are basically B-2 shape copy and X-47B shape copy. Based on what I can see as some sort of scale they look like full sized UCAVs if not bigger?
Could be running RCS tests on opfor platforms - B2 and X-47B or some other sort of evaluation. Although I've no doubt the H-20 will look very much similar to B-2 in its overall shape.