8 million sold.
300,000 sold last quarter, which mean is still highly strong, and will end at a minimum of 9 million on Wii U, probabily even 9.5 million.
It can still sell 10 million on Wii U alone. But in anyway, with the Switch version which looks 99.9% confirmed from the last trailer, i would say this prediction is pretty much done.
Could end well over 10 million Switch+Wii U.