Because you can sync phone wirelessly? And charge using adapter cable.
That would be the obvious one to have when traveling with the Macbook. Have not even heard of a 3rd party working on one.
Yep. iPhone 6S will have USB-C to lightning cable out of the box. 99.9% guaranteed.
I think you might be 99.9% wrong then
The majority of people are still using USB and doesn't have USB-C port on their computer.
I think USB-C Lighting cable will be sold separately. Unless it comes with a USB-C to USB adapter in the box which I'm fine with that