May be showing my real ignorance here, but... is the Summerset prologue quest available on PTS? There's no message stone to access from the Crown Store.
Last word from ZOS is that the PTS will be mid-April. That doesn't explain the patch maintenance though.
either 9th or 16th of april it will beginn.
Just a guess.
Oh, I think it's safe to say there will be news on this soon.
14:00 UTC its more or less the same as GMT? Right...
Its 15:00 for me...