The first Super Mario Galaxy has received a rating from the ESRB for the Wii U as a Wii download. There is currently no release date for the game but the ESRB rating would suggest that it might be coming soon. The second Super Mario Galaxy has been available on the Wii U for awhile now.
Have you played Super Mario Galaxy? What did you think of it? Are you looking forward to downloading it on the Wii U eshop?
Source: Nintendo Everything