Looking at everyone's guesses here and the number of different factors affecting that $400m statement, it sounds reasonable that Halo 5 sold around 3M week one and shifted around 300000 consoles meaning a lot of 360 owners jumped to X1 this week. The rest of the revenue is made up by extra controllers (likely special edition ones) headsets and REQ packs. So a massive success and we will likely see lifetime sales of maybe 8M which puts it in the ballpark of Halo:CE and Halo 2.