Originally Posted by Kades
We're not sure when we will turn the signups back on. We need to do a more efficient job of screening our applicants and need to put processes in place that preserves the experience for people who are trying to report bugs and give productive feedback- and not just try out 'free' content early.
I appreciate your interest in wanting to contribute to PBE- while our invitation process is still being ironed out (so nothing is finalized)- I'm going to push to have people who have actively been reporting reproducable bugs in our 'bugs forum' to get preference.
One of the main goals of PBE was to spot bugs before they go out to live- it makes sense that players who are already reporting bugs on live would be welcome additions. The goal is not to simply provide players with a 'playable preview' of upcoming changes or champions.
Reposting Kades' post here
for future reference. PBE might turn into an invite-only deal and opening of the signups is not guaranteed
That being said, do check up here for updates if you really want to sign up. Who knows, they might reopen at the beginning of January and if you want to join PBE don't miss this thread.