Log in on the site to qualify for beta:

https://treeofsavior.com/

More interesting news here!

The website is now open and features new soundtrack(s). Korean closed beta reveiled to start on December 29th and end on January 11th. Beta phase class information also available.

More info and discussion on reddit:

http://www.reddit.com/r/treeofsavior/comments/2q1lrg/tree_of_savior_cbt_details_revealed/

Enjoy the music:
http://tos.nexon.com/teaser/20141211/index.aspx

Discussion on reddit:
http://www.reddit.com/r/treeofsavior/comments/2oy6g3/tos_has_a_site_up_on_nexon_now/

I'd just like to share this link. What we know about the game is still not much, but this wiki has some useful information in it. I personally found the information about the different classes very useful. I'm not longer as confused as I was :)

http://www.reddit.com/r/treeofsavior/wiki/index