I was in the first closed beta, and they said we didnt have to apply for 2nd cause we were automatically in, but I guess my invite got lost in the mail since it wouldnt let me join yesterday so
If you were in the first CB you'll be in the second CB, they've sent e-mails to all who were in the first CB. All you need to do is just check your bulk mail or log in, it will say "Am I a tester?" log in and hit that and it should say something.