http://www.zdnet.com/article/microsofts-plan-to-move-more-small-business-use...
$7 per user per device per month.
Windows 10 Enterprise plans E3 and E5.
Not mandatory. Yet. But an option for Small/Medium Businesses thinking about the pay-as-you-go method.
No word yet on the carrots they'll dangle to make this attractive.
Or when the sticks come out.