Sales discussion has been more interesting lately...the last couple of 'Globel Up!' threads have had ~200 posts each, which is a huge increase from the ~30 posts they were receiving in the last few months. I guess it's because the next gen is officially underway!
My prediction threads:
Wii U will sell under 40m units (made on 14th September 2012)
PS Vita will sell under 20m units (made on 30th September 2012)
Wii U will sell under 7m in 2013 - I was right