Azure DevOps YAML release pipelines

Question

For a.NET Core Web API project, I am using the following procedure to generate a YAML build pipeline:

https://learn.microsoft.com/en-us/azure/devops/pipelines/get-started-yaml?view=vsts

I observe that the (just renamed) Azure DevOps doesn't appear to allow YAML for defining release pipelines when it comes to publishing it. 

But I can see that there are defined deployment tasks, for instance:

https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/deploy/azure-rm-web-app-deployment?view=vsts

Do you know when the release pipelines capability will be upgraded to enable YAML?