The subscription monetization model is coming to Windows 10. It fits Microsoft's plan to eventually license all software as a service! For now Windows will be sold as a subscription only to enterprise customers. For consumers, it remains a "free service". But it is quite possible that some day Windows 10 will require a subscription fee for consumers too.
With Windows 10 build 14371, Microsoft has introduced a new option that improves the activation feature of Windows 10. With this new option, you will be able to activate Windows 10 even if you have changed your hardware! Instead of a hardware lock, the license will be locked to your Microsoft Account.