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The news has been out since the 11th but with less then a full 2 days left (their starting the updating on the 19th and plan to be finished by the 20th) I decided to mention something as no news has popped up in the news section of the site, or the news section of the forums that I saw.
This is likely the most massive update the game has had to it's core mechanics. It is arguably bigger then graphical updates of the past, even (which is saying a lot for the most prolificly updated MMORPG).
Some basic information is available here:
And an in depth live stream with the main Developers can be found here:
(it's over an hour long and to get right into it you would need to skip ahead to 1min and 13 seconds).