Be very interesting if true. I do wonder what extra Nikon has wrung out of the dual Expeed 6 Processors in the II models. I would imagine it would be more of tweaks, bug fixes and maybe a few minor features or so (maybe Skin Softening for example from the Z8), rather than any meaningful changes or performance improvements to the AF system, which I guess they have already squeezed as much possible (otherwise we'd probably already have that firmware by now).
Any improvements to the firmware for my Z9 would obviously be appreciated.
I for one have been waiting (impatiently) for the 200-600 (or 180-600 if you believe NR) and it's probably the last lens that I really need for the Z series (won't stop me buying more though
). I just hope even though it's allegedly not a S lens, that it doesn't at least extend it's length whilst zooming (similar to the Sony 200-600 unit).