So yet again you make important game announcements via Twitter only
because it's not like we have an in-game home page where you can announce stuff.
More than that, it is made clear from quest giving NPCs and from the campaign store that in order to unlock the quest for the trial, you need to finish the 5th campaign task. This campain task requires 750 Northen War Commendations to complete. With the campaign being out for 2 weeks, non-paying players have accumulated a maximum of 600 currency - so to be able to play the new trial as it goes live, you'd need to purchase campaign currency through the Zen store. You can only do this through the Pack of the Undying, which gives 100 Northern War Commendations, so you'd have to buy two of them at a whooping 4800 Zen (clearly "coincidentally" on sale this week
, as per a very accurate and totally not-out-of-date blog post).
Given that the alleged reason this trial was not on preview for extended periods of time was to not allow some people to practice it ahead of the vast majority of the player base, the fact that you are now going to allow people who pay to practice it before everyone else kinda defeats the point. Game is totally not pay to win tho, right?