There has been little verifiable chatter on new iPad Pro models, and they are supposedly about six weeks from announcement. We have only seen rumblings of a "modern iPad" with FaceID, even though we have seen no case designs or really have no conception of how FaceID would work on an iPad designed to be held both in portrait and landscape mode.
I think there’s Gonna be a delay on the new 2018 IPad Pro But we have some facts.
http://bgr.com/2018/04/25/iphone-x2-2018-specs-chip-a12-processor-tsmc/
TSMC ain’t making the A11 anymore. Period TSMC Factory is fabricating new 7nm A12 CPUs.
So I’m jumping ahead and guessing we will get an A12X