Mark Gurman, reporting for 9 to 5 Mac:

Speaking of the larger screen, we have been told that the 12.9-inch display is a “monster.” To give it truly “Pro” capabilities, the iPad Pro’s landscape split-screen mode will be bolstered to allow two full-sized portrait iPad apps to be displayed. This is unlike the split-screen mode on the iPad Air 2 and upcoming iPad mini 4 that condenses portrait iPad apps to fit side-by-size in landscape mode.

His sources tell him the iPad Pro will feature 64GB of storage and sport a new A9X processor which is said to be a “large” leap over the current iPad Air 2’s A8X chip.

And regarding the full-size split-screen apps, maybe my guess about allowing multiple users on a single iPad at the same time isn’t too far off.