Count me in for also wanting real mouse support. The Magic Mouse 2 and Trackpad should both work pretty much as they do on macOS, with gestures, automatic connecting, and the like. Right now it feels like a beta. I’m happy to have it, but hope they go all the way with it. I’d really love it if they came out with a Smart Keyboard with an integrated trackpad. I use the Magic Mouse at my desk, but that would be infinitely useful on the go.
I’d also really, really like the missing iOS apps to finally make their way over to the iPad. Specifically: Phone app (hopefully with some clever iCloud integrated voicemail access), Weather, (severe weather alerts and a radar view would also be great additions), Health and Activity (shouldn’t be too hard since that data is already synced and stored in iCloud anyway, and it’s always bothered me I can’t view my health data on my iPad), Wallet (now that Apple Card is out I think that’d be extra helpful for transaction history and such), and Calculator (whyyyyy this still isn’t on the iPad is beyond me!)
There are things that aren’t iPadOS specific that I’d like to see as well. I’d like it for alarms and timers to go off on all of a user’s devices, not just the device they’re set on. I’d like it if all nearby devices showed up in Now Playing so you can control what’s playing on your iPhone from your iPad (would be helpful for when you’re listening to airpods).
So yeah, my wishlist isn’t anything drastic, just a bunch of little things that would make it nicer and easier for my daily use.