[lillecarl]

> With the processor unification, Apple may be able to provide a decent experience if they can think of a system that won't kill the battery (external battery the phone switches to?) and can cool the processor sufficiently while it's in a dock.

Why not just power the device off the lightning (hopefully Usb-c soon) cable used for docking? That's how all docks work now. When you're charging a single cell (most phones) you draw power from the charger, with the battery helping out during bursts if needed. No need to invent anything.