Final OP update is done!
Halo 4 sold 7,520,654 copies in 2012, meaning I was 272,346 off.
Amazing sales!
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