They're preparing for anything. Apple has a dislike for relying heavily on any partner in their DNA, thanks to PowerPC.
I think this is exactly it. Perhaps they do have a specific usage in mind that they're aiming for, but I bet they'd be taking these same steps regardless.
Re:Bitcode (iOS, watchOS)
by TazeTSchnitzel on Tuesday June 09, 2015 @10:47AM
(#9686212)
Not just that. Apple also switched from 68k to PowerPC.
True, though nominally the same partner. Motorola was the M in AIM, though yes, IBM did the heavy lifting. (Remember Motorola made a Mac clone? How weird.) And the situation wasn't as dire then.
Least grandiose theory I can come with: two ARM cores in the Watch, one big, one small, with different instruction sets, for active/standby modes.