Yeah I had the same disappointed feeling but maybe it's a sign of features to come? This is a small initial rollout of a future more expansive feature?
When I read the title I thought that they were announcing something like Anbox, which runs android apps in containers. But it is actually just about mirroring the android screen... I'm not sure why that would have be a feature baked into the operating system. Seems more like a marketing strategy imo.