Nintendo has updated the footnote in a recent Iwata Asks that gives us a clearer picture about the release date situation for Pikmin 3:

Pikmin 3 is scheduled for release for the Wii U console in the spring of 2013 in Japan, and during the Wii U launch window, from system release thru 3/31/2013 in the US.

Basically Pikmin 3 is still in line for a launch window release for the Nintendo Wii U in North America. The game will be arriving in Japan in the Spring of 2013.