Ok. I have already answered to this question on another post and for some reason, my reply got ignored.
If you were part of a previous beta phase on PC, you are automatically accepted for phase 4. They won't send you an email, since you're already registered for it.
Stop worrying about it, as soon as the new client will be released you'll be able to download it and when phase 4 starts, you'll be able to play!
While it's true you don't need an e-mail if you played the beta on PC, you will
need one for PS3, with a new code to download the game from the Playstation Network. So far they have sent an e-mail to tell us that they will send another e-mail later with a code and instructions.