Exactly what @notriddle said. In case you’re curious/want more detail:
We release updates to Discourse regularly. In general, you can expect a new beta release every 3 weeks or so, sometimes more frequently. We’re currently working on the 2.0 release, and as you noticed we just released the first 2.0 beta. We will continue to put out beta releases until we’ve completed everything in the release plan (that plan is tentative and subject to change).
Once we’ve completed all planned features and are confident we’re as close to bug free as we can get we release a new stable release of the major version. Then we move onto the next release and the process repeats itself.