As of now, the RSOD playtest is open! Go ahead and try out the current build, but be prepared for bugs and missing content.
Where are we at in terms of release? Ideally, that will be in a year. I think you will see that the content available right now is not enough to call a "game", but now is the time to give feedback.
If you have any, please use the feedback form at rsodgame.com.
Come get some!