This one is going to be a short post. One of the big capabilities of SQL Server 2019 – the ability to deploy AGs using containers – is not shipping when SQL Server 2019 is released. My guess is it it will be enabled in a CU sometime after its release. From the RC1 release notes:
The Kubernetes operator for Always On Availability Groups is not supported in this release candidate and will not be available at RTM.
I’ll update this blog post when it is lit up in SQL Server 2019.