In addition to the rumored iPad Pro expected later this year, Apple is said to be working on several additional hardware and software improvements to the iPad, according to a new report from 9to5Mac. Rumours have been circulating for some time now regarding split-screen multitasking on the iPad — a feature that was expected in iOS 8 last year — however sources now suggest that the side-by-side app support feature will arrive with iOS 9, and in…