Well I don't think we will see more "Pro" with iOS10. We will just see few minimal UI improvements, iOS does not change that much, look at iOS 7>8>9, just minimal "hard to notice" improvements.
We will also see more features that tries to tie you to their eco system.
As example, Apple even tried to disable the Pencil Navigation completely in the lastest iOS release(Public Betas), but then users started to moan around, and they made it available again.
Apples primary priority is now the iPhone, other devices just exist to support the iPhone sales.
I think Apple would even ditch the MacBooks at the long run, if they were not needed to develop iPhone Apps.
With iOS10 we *won't* see any "pro" iPad features like...
- Advanced printing options
- Configurable keyboard delay and repeat setting
- System wide PDF printer
- App shared local storage location, with file manager
- Native SMB,FTP,AFP Support in a file manager
- Optional and Permanent Desktop Safari User Agent for iPad Safari.
- Safari Download Container incl. Queue
- Build-in Calculator App
- Build-in Weather App (not pro, but usable)
- Change Default Browser App
- Change Default Email App
- Change Default App of file types
- Native usage of the iPad Pro as Wacom Like Device on the Mac
- Build-in Font Manager
- External Storage Support to write and read anything you want.
- Mouse Support
- Mobile Xcode
- And more... the list could be very long.
Somehow im looking very optimistic forward to the Ms Surface 5, I think they will improve the Ntrig Pencil a lot, because Microsoft bought the company recently. And if they fix the Pencil lag, precision, sensitivity then i'm sold to Microsoft(again).
Windows 10 got very usable
I don't mind 1h more or less battery life
Windows has far more and better "pro" Apps.
You can join Domains, and be part of Active Directory, access all kind of Storage types and Shares(SMB,FTP,FTP,WEBDAV,*CLOUD,etc.)
You can connect a mouse.
You can connect all kind of hardware to it.
They now even have Unix cmd/bash support.
Ms keeps adding great "pro" features, while apple just care of UI and eco system improvements/tying methods for noobs (reducing features and add unnecessary limitations to iOS).
I own an iPad Pro 12.9, but i wish i could do more with iOS.
So if you plan to buy an iPad Pro of * size, don't buy it with an illusion of getting more "pro" features with iOS10.