Microsoft announce that there will be a new benefit for customers who have Windows Server licenses with active SA or bought as Software Subscriptions through CSP. This is an extension to the Azure Hybrid Benefit and will allow customers to use the Azure Kubernetes Services (AKS) on Windows Server and Azure Stack HCI at no extra cost.

You can find the announcement article here: https://bit.ly/3S4ldHf, and this page has a great diagram explaining all the different flavours of the Azure Hybrid Benefit and how they might work together: https://bit.ly/3Te7A9G.