So by the looks of it Wii U should be around 3.3m by the end of June which is a few 100k behind PS360 in the same time frime. In the second half of the year with big games releasing+new marketing campaign+price cut/better bundles and a strong holiday season, I think Wii U can end the year around 8-9 million which is the same range that PS360 had at the end of there first full year.
When the herd loses its way, the shepard must kill the bull that leads them astray.