I have a nagging suspicion that Apple will eventually lock the hardware and OS down to the point where their computers will only run software delivered through the app store.
There's likely a way to make both of these things happen, to some degree. For instance, they could start with just locking Macs to the app store as a default that is changeable. (similar to how Android is locked down)
There are several good alternatives to the Mac Books now and I'll be moving to Linux for my development efforts the next time I buy a machine.
I would like to add that I don't see the Apple garbage can as a suitable hardware offering for serious editors.