I believe those aircraft are being worked on by external teams. Asobo, from what I understand, is focused on the sim itself. So while not a lot is said, I do believe they are working on improving all the key areas. That’s the whole goal of “outsourcing” aircraft.
From the 12 that were just released with SU11, I believe only the G2 was developed by Asobo because Sebastian needed to do it to work on the flight dynamics too.