The well-regarded leaker Steve Troughton-Smith claims to have found references to unfamiliar iPads while diving into the code for the iOS 12.2 update. It suggests that new 11-inch iPads, as well as an iPad Mini, are on their way. The code also specifies an iPod Touch that could be of the rumored upcoming 7th generation.
https://www.notebookcheck.net/iOS-12-2-code-hints-at-possible-new-iPads-and-iPod-Touch.400811.0.html