I think those pics were taken during a joint exercise with other countries, probably Russia and other SCO states, because you can see Chinese flags painted on the vehicles which would not be necessary if it was an exercise amongst the Chinese units themselves.
This tells us that the new type 99 variant has been in service for sometime and that the PLA is comfortable with their use and not concerned about showing them to other exercise participants.
Latest type 59 mod.
The armor cladding reminds me of the terra-cotta soldiers' body armor.
It hasn't been talked about in a while but is that still an APS on the turret?