I'm surprised that Apple haven't done this with the Macbook/Macbook Air yet - a machine that can switch between OS X and iOS modes with the ability to remove the screen for an iPad Pro experience. If the detached screen could also be switched into OS X when not joined, or perhaps paired with a BT keyboard then that would be nice too. (E.g. grab screen to take to work for some iOS fun/videos on the train. At work, realise you need to carry on some serious work so get the BT keyboard you keep at work, connect, switch to OS X, work on document in iCloud).