VT-4 is only getting started, there are a lot more to come. It will be replacing all the Type 59s and 69s. That’s nearly 600 tanks.
The next iteration of AK is to start production After AK-1 deliveries are done in around 2 years. We have a rough idea of what we’re expecting to see on it, not sure if it will be called the AK-2 yet. However for an APS, we cannot make one. Our best bet is to purchase them from China (and I believe we will, but only after all the older tanks are retired and PAs fleet has reached a size at which they want to stop). Those are expensive but very effective upgrades.
Check the Al-Khalid and VT-4 threads for more info