I installed the latest iOS 13.1 on one of our iPad Pros (2018). iPadOS - the new operating system should work on iPad 5, iPad Air 2, iPad mini 4 and the latest Pro models.
I tested with external display (lightning adapter) and while working in a single player session i didn´t experience any issues so far on my iPad Pro (2018). As soon as i have more devices updated i will try multiplayer sessions.
The external display on USB-C models still causes problems. We are working on a fix for that issue.
Keep you posted!