The October 25th patch is also an apology of sorts for the previously botched black stone event. Since the drop rate on that wasn’t quite what the devs expected, they are bringing the (fixed) event back for another run from now through November 8th.
Indeed, additional server issues seemingly introduced by the patch caused server outages and crashes yesterday; expect more downtime today as it’s worked out.
Other changes of notes with the patch include class balancing tweaks, a smaller game installation size, a fix for challenge rewards, two new level 60ish challenges, and a chat link function.
https://www.youtube.com/watch?v=jMsISAaB1aQ
Source: Patch overview