Super Mario Galaxy has been rated for the Wii U by the Entertainment Software Rating Board, meaning the Wii title may be coming to the Virtual Console. The ESRB rating was first spotted by Nintendo Life.
Super Mario Galaxy for the Wii U has not yet been announced by Nintendo. The game has already launched for the Wii U in Japan through the Virtual Console. Super Mario Galaxy 2 is already available worldwide through the Virtual Console, and sells for $20. It was simply a port of the title, and not a HD remake, meaning the same could be true for the first game.
Super Mario Galaxy first released on the Wii in 2007. The game was first announced at E3 2006, and released to critical and commercial success. In September 2015, Nintendo announced that over 12 million copies of the game had been sold worldwide.