Just received a few notifications that Wintersebb is currently down for a restart and the estimated time for it to be back up is 3:00 PM Pacific. Of course yesterday Thistledown was experiencing the same problems and was up much earlier than anticipated. Hopefully that will prove to be the case again today.
Update: Darktide joins the list of servers being restarted. It too is expected to be up by 3:00 PM Pacific.
Update Again: Both worlds appear up and running now. Woot for quicker than anticipated restarts!
Last Update: It looks like they are just cycling through the worlds. I'm not reporting any more of these. :P