Deactivate 'Nike+' exclusive features form AppleWatch 2 - Nike+ edition
Because the AppleWatch Nike+ edition isn't available yet this information is not available .. BUT I do can tell your able to turn off the notifications, just like the 'breath' / 'you need to stand for 1 minute' (while driving your car) notifications. You can change your watchfases to normal version but won't be able to remove the nike+ app from your watch as it's bound to the exclusive Watchface.