Nintendo announced that Netflix is now available in Nintendo TVii. According to the Wii U facebook page:
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.
Netflix will automatically appear as an option when appropriate, so there is nothing to update.