We saw references to a "Modern iPad" (Face ID) in iOS 11.3.
That actually meant nothing:
https://twitter.com/stroughtonsmith/status/956614355524694017
While I agree that they would earn more money from the Pro over a cheaper iPad, I'd still see it as a bad move - and I'd also be shocked we don't know more about these devices. Face ID would require a design change, we knew loads about the 10.5" ipad 3-4 weeks before it released where aside from the obvious "Face ID will come to ipads in 2018", we know nothing about new pros right now.