http://www.savecontinue.com/2014/04/xbox-one-production-slowing-whats-next-microsoft/
Actually I don't think MS were expecting to sell 1M per month on the first year since that would be a really high pace. They probably have contracts with less speed turn around time, and maybe they started earlier or the contract had a clause for so many produced before launch.
And if we look at PS4 now selling around 120-150k a week and still supply constrained Sony may have the same kind of deal in place (less than 1M per month contract but a minimum for launch), or else we should think of supply tampering to ensure scarceness or they are holding to release a lot with the next big release (maybe TLOU remaster).

duduspace11 "Well, since we are estimating costs, Pokemon Red/Blue did cost Nintendo about $50m to make back in 1996"
http://gamrconnect.vgchartz.com/post.php?id=8808363
Mr Puggsly: "Hehe, I said good profit. You said big profit. Frankly, not losing money is what I meant by good. Don't get hung up on semantics"
http://gamrconnect.vgchartz.com/post.php?id=9008994
Azzanation: "PS5 wouldn't sold out at launch without scalpers."







