http://www.techradar.com/news/face-id-could-be-coming-to-the-ipad-pro-next-year

We've not really had chance to put the Face ID recognition system on the iPhone X properly through its paces yet - but according to those in the know, Apple is planning to add Face ID, and the TrueDepth camera that powers it, as an upgrade in its 2018 edition of the iPad Pro.

That's based on a report from well-placed analyst Ming-Chi Kuo of KGI Securities, who has a decent record of predicting Apple's plans. Whether or not the home button will also get ditched on next year's iPads isn't yet clear, however.