Again--it's just one thing it won't get--the ability to keep all 3 apps in multitasking active at once. On iPad Pro 9.7", only the top app will be active, the other two will gray out while you have the top one open. Any iPad with 2 GB of RAM or less will have this issue.
I have a 12.9” 1st gen iPad Pro that has 4GB of RAM with iOS 11 beta 1 installed. And I have the issue of having 2 SplitView apps open along with the floating app. The floating app on top is the only active app I can interact with.
Now, I’m not sure about the 10.5” and 2nd gen 12.9”, so perhaps it can be about A10X only feature. But I can confirm 4GB of RAM on my iPad Pro has that same issue.