I really believe that, at this point, we’re looking at an iPad Pro (A14X-based) refresh in either March or June of 2021. The iPhone 12 (A14) is Apple’s paramount concern right now. Getting it right, getting 5nm yields up to where they want them to be and making sure 5g is really ready for prime time, among any other upgrades that Apple wants. Given the issues with coronavirus, I expect Apple has its hands full with just getting the iPhone 12 ready to go in time for a September event.
Anyone counting on an A14X iPad Pro in the Fall should temper their expectations.