New content? I just found out.
Usually the star in the top right corner has text in it so I am assuming that is a bug (that would of told you where to go), but the star itself is probably a big hint.
You could of also checked the patch notes on these forums for that information under the “Game Release Notes” or check dulfy, the Guild Wars 2 subreddit (unless you count those under the suspect security)
Not a suspect website with information about updates:
The Burninator
I was a little surprised about the festival – it was largely unheralded, especially if you don’t follow the forums. Although the main giveaway was the patching at launch which prompted to me to check the release notes.
No biggie though, was a nice surprise at least.