Apple is prepping a next-generation iPad Pro with a new premium glass back finish in order to enable wireless charging reports Bloomberg. Changes are also in store for the iPad mini as well as the entry level iPad.
https://www.notebookcheck.net/Next-generation-iPad-Pro-set-for-premium-glass-back-finish-with-wireless-charging-support-more-details-on-redesigned-iPad-mini.543094.0.html