The Microsoft inclusion in this article is weird-MS announced the Pro 4 and Surface Book when Skylake first launched they aren't expected to release new updates really until next year sometime in the spring from the rumor mill. As for going with an older dGPU they probably didn't want to do too much extra work while working on an updated unit anyways coming out so soon.
The Apple bit was interesting because I was wondering about that a little. Makes sense and I doubt there is much of a loss in going with Skylake for them anyways.
The other thing as MS learned with the SP4 and SB is being the first out the gate with new processor tech isn't necessarily in their best interests given all the issues they had to fix with updates and working with Intel. If you sell laptops based on their reliability I wouldn't be jumping into the Kaby lake fray so soon after launch...just in case.