fakruzaruret on our website you have to take "coming soon" with a grain of salt, as most texts have not been updated for a long time. Most of the things we announced in the feature have been pushed back for after stable. Our GitHub milestones and issues give a better overview of what you can expect in the near future.
Right now Kyrne's extension is the only option I know of for self-hosted websockets and the core team isn't actively working on such a feature.
