@randomradio , notice the satin, metallic-like sheen that I don't think we've seen until now? If my eyes aren't deceiving me, it kinda resembles a similar ram-like finish we see on the F-22 and F-35 with the angle of the sunlight catching it just right in these series of photos.
With the gun testing on several of the prototypes and now what looks like a possible RAM finish, maybe we're close to seeing the end of testing and possibly a start of production. Hopefully they've already been through weapons bay testing and the Izd-30 is ready too.