The iPad Pro allows users to run two apps side-by-side on the 12.9-inch display. This is a feature we've used on the iPad Air 2 with iOS 9 and we found that it makes for a much more productive experience.
By combing the ability to use two apps side-by-side on the iPad Pro with a iPad Pro keyboard there is an opportunity for significant productivity an it might make the iPad Pro a laptop replacement for some users.