Sources are... everything. Seriously.
Ask experts like franco-russe and kcandrew about it, and they will tell you the same things. PLA Orbat discussions are topics that go on for several years and include detective work encompassing everything from official statements, netizen reports, random photos of AFV's being seen on trailers at some rail-station, PLA insider-comments and of course guesswork. After that, identifying tactical numbers/turret numbers and digging in PLA personalities and lists about disbanded/reformed legacy units are yet another entirely new can of worms that must be opened. If everything works out, we have a semi-complete Orbat of a regiment... until brigadization happens and everything is thrown off course again.
As for production numbers... Even though you didnt imply this; I still have to mention that I wouldnt be so sure about the further escalation of main battle tank production.
The ZTZ99B will most probably be produced at the same pace as now, replacing the ZTZ99A production lines, and the ZTZ96A will also still be manufactured, but one has to keep in mind that the PLA is currently turning some formerly heavy mechanized/tracked units into light mechanized units or amphibious mechanized units equipped with ZBL09 8x8 IFVs and its 105mm assault-gun and 122mm howitzer derivates, or ZTD05 amphibious tank and ZBD05 amphibious IFVs respectively in due order, so that these units will just hand over their main battle tanks to other units. A good example is how the 335th regiment of the 112th HMID gave away all their tracked vehicles (they were ZSD89 APC's and ZTZ99A tanks) to another unit, while receiving ZBL09 IFV's and derivates in return, turning them into a chinese Stryker-brigade of some sorts. The tanks they have handed over were received by a unit in Shenyang MR, which now replaced their ZTZ59s with these new tanks without ever increasing the production number of this type in general.
So, PLA modernization shouldnt just be seen with only the main battle tanks in mind, but also with the overall mechanization of the armed forces.