Thanks for your reply Peijunfei, but is the ZTZ 99A tank with the GL-6 aps recently nothing more than a testbed for the new generation tank or will it become a new variant of the 99 family in the near future?
the mose recent vid from Douyin(China's local version Tiktok) shows the new "variant" with the RWS have already been manufactured in batch, at the location of Baotou, where the factory is. But the one with APS is the only one, assuming the test vehicle, and it appeared at Hebei province, where people believe the test base is.
So I do not call it a new variant, since I researched 99A for years, PLA keep update and changign small details, many parts are different from the original 99A but those details are hard to tell sometime. Foe intsance the 2nd gen Beidou GPS system atena, the remove of mm-rador and Identification Friend or Foe Sytem atena (more advanced integrated system are used, no need for them be there), and even the frontal turret armor are slightly changed...so adding a RWS is not a big deal. I w Iwill not call it a variant.
On the other hand, PLA knows the limits of 99A. The upgrade potential of 99A is very limited due to its (realtively) poor chassis/suspension reliability. That's also why 99A does not use side attached armor. So there is no need for an upgrade varient, just go for a new one is better option. Since VT4 series has been tested and improved in international market, more reliable chassis/suspension, more integrated powerpack, and so more ready to use stuff can be quickly assembled and tested in so-called "4th gen" tank.