Berkeley has a 2 step admission process. The first step is a first read by dean Tom--after you go "complete". He either auto-admits you (big numbers), rejects you, or sends your app to the committee. That email tells you that your app went to the committee. You weren't an auto-reject or auto-admit. Statistically, I believe the ratio of admits the committee can do is about 1:8 (however, it may be worse this year due to a larger number of apps). Those emails also tend to go out en-masse, so it's bad news if you didn't get an acceptance or an "under review" email.