I reckon this dev team is moving at breakneck speed to get Windows 10 ready to ship.
Let's face it, Windows 8 was a total disaster for Microsoft. I cannot remember reading about one company that actually decided to take the plunge and upgraded their whole network to Windows 8. No sir, they all stayed put on Windows 7 Pro.
And Microsoft alienated some customers who moved over to OS X or Linux as their OS of choice.
But I firmly believe Windows 10 will be the consumer OS that saves Microsoft and really bring them back with a bang.