Spoken like a true Belgian
I suspect Edmund is referring to the SmartAdapter which is C only.
The Ultra-whatever-booster is both C and N.
M
From dpreview: "One of the most impressive features of the a7R II is its autofocus system. 399 phase-detection AF points cover 45% of the frame, which means over 60% coverage in either horizontal or vertical directions in the frame. That gives it more coverage than any full-frame camera out there. PDAF will work even with third-party lenses via existing adapters, including in continuous AF tracking mode.
This is potentially a huge deal - especially for Canon users. We've used an a7R II with a Canon 24-70mm lens and a Metabones adapter, and focus is indeed very fast indeed. We'll be looking at this in more depth as soon as we have a production sample camera, but for now, we're highly impressed. Canon should expect some cancelled EOS 5DS orders..."
Your interpretation is as good as mine. I suspect both C and N will change their lenses to preserve lock-in.
Edmund