Hi,
Just wanted to let everyone know that there is now also a public beta available. You can download beta version as an update preview, features may still be missing and/or may be unstable, It's named "publicbeta" and is available under BETAS tab; right click on the game in your library, select properties, click on tab "BETAS" and select "publicbeta..." from a drop down box, there is no password.
Cheers!
Nejc L.