Actually, it is 1 month old, it has been updated for November. If you read through the 5 (or basically 5th) posts, you'd see it's closed because of the huge amount of new players on the PBE, resulting in HUGE queue times.
However, I'll give you that they aren't the best when it comes to handing out info... Their FAQ is never up-to-date afaik...
EDIT : Dayum, they proved me wrong on this one :/
Originally Posted by FAQ
How do I join?
Sign-ups are currently closed. We expect them to open back up around late December but that date may change.