They will have more information about the Technical Test next week. The test will be small in scope, since the game is still in development and has a few known issues, so if you don't receive an invite don't be discouraged. they plan to have a much wider beta early next year.
beta sign up:
http://tera.enmasse.com/consolebeta
beta sign up:
http://tera.enmasse.com/consolebeta