Frankly I think the designations for all of these "new" BVR missiles are going to be all over the place for the next little while.
In terms of new/upcoming BVR AAMs that have been either confirmed/rumoured:
- PL-X/PL-17/PL-20, which is the VLRAAM seen carried previously on J-16 and now on JH-7/A, whose existence is basically confirmed but whose designation is not.
- PL-20/smaller size BVRAAM for J-20, which is the BVR AAM mentioned by the likes of yankee and so on in the past that J-20 is meant to carry six of.
- PL-21/ramjet BVRAAM, which is of course the ramjet BVR AAM similar in concept to meteor that has been rumoured on and off for the last decade.
IMO the designation of all of these missiles are all still up in the air at present.