Soundwave on 12 November 2012
5.5-6 million sold through the first March is basically the standard for any Nintendo console.
They forecast 6 million for the GameCube through March 2002 (though they failed), and a similar number for Wii through March 2007 (they hit it).
I think Wii U will have a good first holiday season and a solid first year with some ups and down, but I'm not sure if this is a platform built for a 5+ year life cycle. I think it will start to fade by about year 3.
