The next PTS isn't up yet. It most likely won't come until Summerset is being tested.
Jester Festival doesn't need to go to the PTS, since it's just a copy of the one we had a year ago, with just a few new rewards (Worm Cult motif this year).
They only put the new content on the PTS, like the Dragon Bones update last time.
I tend to frequent the PTS forum a lot when we have a new update on the PTS, both to see what new content and systems is coming, as well as giving my feedback. I have had changes made and bugs fixed as response to my feedback, so sometimes they do listen, even if the wall of noise can be hard to penetrate at times.
Other than that, I use the Housing and Crafting subforums a lot, I guess that shows what my primary interest in ESO is.
I also look at the Crown Store sub a little, mostly to see what feedback people leave to whatever is in the store at the moment.
Anything which isn't old is normally on the first five pages of that. Then checking Unanswered every morning to see if there is anything which hasn't been answered yet and I know. Participated for seeing which threads have been updated.
It's not a great means of doing things as I often miss threads which I find interested (normally over the weekends when I game more than forum).
@Turelus - EU PC Megaserver "Don't count on others for help. In the end each of us is in this alone. The survivors are those who know how to look out for themselves."