I remember being annoyed with Apple when the iPad4 came out after buying an iPad3.
But you know what, that iPad3 lasted us a few years, so was actually a good purchase, just not as good as the iPad4.
If we get a new iPad Pro soon then it proves that Apple is very serious about augmented reality, and that the 2020 iPad Pro was all about the Lidar for developers and the new AR features.
By the way, the cool new AR features require a minimum of an A12 processor so expect the A10 devices to disappear very soon. I expect that to remain to be the base needed for a few years so those who bought a 2020 iPad Pro still have a solid machine. If the iPad becomes A12, then the iPad Air needs to be A12X/Z and the iPad Pros need to be A14+.
The question for me is the order of upgrading them, if they update the basic iPad first then the Air becomes bad value, if they upgrade the Air that means the basic iPad is stuck on A10 and pretty much obsolete. This is why I think the new iPad will replace the iPad and the iPad Air and have an A12X/Z. I would love a new 11 inch A14x iPad Pro...
I am waiting to see what to buy come Nov/Dec time... I need a Lidar device and want an AS Mac.