Slava @ RethinkDB here.<p>&quot;Developer preview&quot; means we&#x27;re still going through internal testing processes. The code review is still in progress (the windows port hasn&#x27;t been merged into next yet), and the build hasn&#x27;t been widely tested in the wild.<p>Everything seems stable and there aren&#x27;t major known bugs, but there is still work to do before we can label the windows port production ready.