It’s official, Nintendo has provided the following statement to IGN regarding NA Wii U production:

“As recently posted by Nintendo on the Wii U website in Japan, Wii U production will end in the near future for the Japanese domestic market. We have nothing to announce in terms of exact timing.We can confirm that as of today, all Wii U hardware that will be made available in the North American market for this fiscal year has already been shipped to our retail partners. We encourage anyone who wants Wii U to communicate with their preferred retail outlet to monitor availability.”