This is the first build which supports exporting to the Wii U. However this release by itself does not actually ship with the necessary features to export for Wii U - a separate addon is required (and the addon will only work with this build or newer). This is due to Nintendo's restrictions on developing for the Wii U. We'll be releasing more information shortly about how Nintendo Authorised Developers can obtain the new addon and take advantage of the new exporter. Stay tuned!