I had the update to win 10 1511 in Windows Update. It downloaded and prepared to install and then nothing... I noticed that the $windows.~bt folder is almost 6gb and most of the files have today's date so I guess the update is here but it isn't started by windows...
It hasn't changed as expected. M$ urges everybody to get and install Win10 so they won't change that protocol to make migration easier... for now. Who know what M$ holds for the not so distant future on KMS activation terms when half Earth's population runs W10 on their machines
I think they have given up on pirates... The money is with store/advertising - I'm a bit surprised there is no cheapo special though - maybe 08/2016.
After downloaded all the files it will say an error occured and try again. You will try and it wont update. And then surprise. it says you are up to date 10240.