Detail component in V13

Is the Detail component only coming in 13 Final or do you have to do something special to include it in 13 beta1?

Yes, according to the [roadmap]
(https://github.com/orgs/vaadin/projects/1), a Details component (backed by a vaadin-details Web Component) is coming with Vaadin 13. It looks like it wasn’t shiped with 13.0.0.beta1 but it is in 13.0.0.beta2.