Yes, my NA-7DMKII housing is fitted with the Nauticam vacuum system. I had a third party vacuum system fitted to my old NA-7D housing before the Nauticam system became available. The Nauticam vacuum system is much better than the system fitted to the older housing, the Nauticam vacuum pump pulls the vacuum down much quicker, the vacuum can be released without having to reattach the pump and the warning light system gives a constant indication of the state of vacuum inside the housing. Happpiness is a nice green light shining on your housing.
I've just got back from a trip to Ambon, Indonesia and used the 7D Mk II in a Nauticam housing for 30 dives during the trip. Having used the original 7D in a Nauticam housing for nearly 5 years the most notable improvement with the 7D Mk II is the autofocus, it is very fast, accurate and performs well in low light conditions that would have required a focus light with the original 7D. The Nauticam 7D Mk II housing is also excellent, by far the best housing I have ever used (it is the 8th housing I've owned). I am preparing a full review of both and will be posting it on Wetpixel in the near future.
I've been using a Subal/Nauticam adapter with both my 8 inch Subal dome and 4 inch Zen Subal mount dome for over four years with no problems. The adapter does not add any extra extension, it is designed so that it positions the dome port and Subal recommended extension rings in the correct position relative to the lens just as it would be with a Subal housing with the same port/extension ring combination