Nokia N9 MeeGo always rumored to run the latest version, but the promotional video that appears shows the user interface will be strongly influenced by Symbian Anna and is not 100% sure to use Meego.
12MP camera in Nokia phones is nothing new, because it appears the previous rumor info.
But yes, this is the first time we could see it confirmed in the semi-official video. We also see that Nokia N9 equipped with Carl Zeiss lens 28mm wide angle and F2.8 aperture size, so it sounds very similar to the Nokia N8 and has a dual LED flash instead of xenon units such as the N8.