Reach will likely be a 10 Million seller. 11 (Or more?) if you count bundles not counted on VGChartz.
GT5, without major bundling, is probably gonna be sitting at ~9 Million. Major bundling will probably push it to 10.
These sales added bring Halo to ~47 and GT5 to ~67
Halo 4 is gonna release 2012, ~ 10 Million seller.
Halo Wars 2 Kinect will (should) release early 2013, ~2 Million
GT6 Prologue will release as a PS4 launch title, Holidays 2013, ~ 2 Million
GT6 is gonna release a Year later, Holidays 2014, ~9-10 Million seller
Halo 5 Nextbox is gonna release during the Holidays on 2014, ~10 Million seller
I'd also say there will be a GT Vita and a Halo launch game on the Nextbox, somewhere in all that. Maybe Halo 5 WILL be a launch game on the Nextbox on 2014. Either way, the gap should decrease fairly quickly over the next few series releases.
Predicting is fun.
