Biggest change I see in iOS 10, beta 2, is that the App Store now updates apps with multiple AppleID's without having to logout/in over & over.
As a developer, I use multiple accounts to access the stores in different countries (some clients only release their apps to the US store, others only to the Canadian store). Now, all of them will just update, even ones for accounts I'm not currently signed in with!
The next step (or in this step) is to give us accounts management similar to Apple TV where you can add as many Apple IDs as you have. It should let you switch between them so you can channel browse their respective App Stores.