Nintendo of America has announced via Facebook and Twitter that Netflix is finally available on Nintendo TVii.

Quote Originally Posted by Nintendo of America
Netflix has arrived on Nintendo TVii. Now you can find even more of your favorite TV shows and movies right from your Wii U GamePad. You don't need to make any update to your profile Netflix will automatically appear as a viewing option as long as the program is supported by their streaming service.
Nintendo TVii is only currently available in the United States and is supposed to be coming to Europe sometime this year.