Closed Beta will be launching at the end of this week (Lammania will close shortly to support that).
If you pre-ordered Shadowfell Conspiracy and registered your key in early to mid June, you can expect an email invitation soon. Invitations will continue for later rounds, with priority for VIPs.
Thank you for all the feedback during this enhancements preview! We will spend the Beta period focused on fixing bugs and improving the enhancement trees in general, but have two major changes already underway.
Favored Soul and Cleric: We will be replacing the "Protection" tree with a melee-focused "Warpriest" tree, likely in the first patch after expansion launch.
Sorcerer: Sorcerer will get a new, additional enhancements tree later in the year (likely U20).
I'll save the details for Vargouille or one of the other designers to dig into.