I can't really escape a feeling which tells me that apple wants to get rid of OSX completely. Ever since I posited the possibility a few years ago, they have followed my estimated trajectory almost perfectly, only a little slower. Bringing more and more iOS into OSX, even where it doesn't _really_ fit. The dual use file system lockdown (etc) feigning increased security as it's sole motive, but in reality it's as much about pushing all code within a set of API's shared between iOS and OSX.
I admit it sounds a bit like crazy talk, I guess we'll find out in a couple years.