As well as the Azure Stack HCI news, Microsoft have also added Azure Hybrid Benefit (AHB) for AKS (Azure Kubernetes Service).
How it works
This benefit is available for Windows Server Standard and Datacenter (both with SA) and also CSP server subscriptions. Hosts must be Windows Server 2019 (and later) or Azure Stack HCI
Each Windows Server core license w/SA allows use of 1 virtual core of AKS. The AKS AHB is additive, meaning the licenses can be used to cover on-prem/Azure workloads AND to use AKS. You can see more info here.