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Apps side-by-side, or 'split-screen': it's an unlikely feature, but it would make particularly iPad users more productive by having two or more apps open at any given time. Copy and paste would no longer require switching between apps; the apps would be open on one screen. It's a desktop-like feature and could be seen as regressive for a mobile operating system. And, it wouldn't really work on the iPhone or the iPod touch, but Apple has separated features out between the two fragments of its iOS ecosystem before.
Image credit: ZDNet.