I don't care for better hardware - but I do absolutely wish for better software. IOS on an iPad sucks so bad it's a complete joke. Have to do a ton of fitting to get this square peg in this round hole type of workflow process.
They need another iOS iPad team dedicated to make the iPad better. Otherwise it's a giant iPhone - which on a 12.9" display is complete waste of space.
iOS on the iPad is a complete joke? Not a partial joke, but complete? Apple has reached the pinnacle of jokedness on the iPad... there's no room for it to be more of a joke?
I'm poking fun at the hyperbole but it would be helpful to provide some areas that you find frustrating with iOS on the iPad. Maybe there are ways to accomplish the task by "thinking different", maybe the task being attempted is a reflection of how things are done on desktops and notebooks but aren't practical on a mobile device, and maybe there is indeed a deficiency with iOS that needs to be addressed.
I have used iPads every day since the first day of the iPad 1. Over time I've begun to think differently about how I do things, why I do things, and what I do on my desktop, notebook, and tablets. I've learned how to adjust my workflows for the devices that I have to use them as they were designed (and to push the boundaries on them).
I don't "need" an iPad (and now iPad Pro) for my tasks. But I WANT to use it. That has driven me to find different approaches to the things that I do. Some of these new approaches are actually BETTER than how I previously did them on desktops/notebooks, for other things, not so much. It's been a fun journey, and there have been irritations along the way. The greatest issue for me is not iOS itself, but the apps that LOOK identical to their OSX counterparts but aren't. Stumbling over those differences has been a significant source of heartache, heartbreak, and heartburn.
As much progress as I've made, I'm embarrassed by how much more functionality the iPad has that I haven't even begun tapping into. The daily grind has me focusing on work with little time left to "explore".
As for the iPad Air 3... nope, not going to happen. As others have said, the "Pro" moniker is a replacement for "Air".