I updated the post with the correct release date. There's loads of news available about the patch, but I decided to keep the list short since I don't have time to write all the details.
Still a bit disappointed about only two new dungeons and no new primals (I wanted another Ex Primal), but I can't blame them since they'll give us a new mini-game, airship missions and another fight with Thordan. The "Warrior of Darkness" stuff could mean that we have some secret ties to the Ascians or maybe an alter ego who is on the Ascians' side. The trailer is also a bit too spoilerific near the end.