Hi,
Well, Microsoft has been in the Unix camp before, with Xenix and
SCO.  [Witness my Trs-80 Mod 16 runs it].
But speculation aside, Apple is the one gobbling up both Unix and
[Windows application functionality] into their new OS.  That's scary
in a very comfortable way.  The old NeXT underpinnings with Linux
innovation, etc. is turning out to be ultra-powerful!
Thomas