Here is some vital info...
Halo: Reaches online numbers peaked at 900k THE FIRST FRIDAY AFTER LAUNCH. Tonight is the time to check Halo 4's numbers.
HOWEVER, reaches numbers included people who were playing campaign, forge, firefight, theatre and even people who weren't playing anything and just sitting on the home screen or something. Halo 4's only shows people who are ACTUALLY PLAYING in each individual playlist...so 300k+ is MASSIVE!
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