Apple is now projected to upgrade some of its next-gen iPads with OLED displays. Now, a Korean publication has mentioned 2 specific sizes for the high-spec'd screens involved. However, one of the devices in question may have dropped out of development as the Cupertino giant cannot source the exact kind of OLED it wants for the putative tablet.
https://www.notebookcheck.net/Apple-s-upcoming-OLED-iPad-is-one-of-the-latest-victims-of-the-global-supply-chain-crisis.567462.0.html