Check out the Patch Notes for more info.
The most interesting parts imo are of course, one: “The Ruby Sanctum” and another interesting thing is the Dungeon Finder Vote Kick system change.
The functionality of the Vote Kick feature in the Dungeon Finder will now behave differently according to a player’s history with the system. Players using the Dungeon Finder who rarely vote to kick players from a group, or rarely abandon groups before a dungeon is complete, will find that the Vote Kick option will have no cooldown. For players who frequently abandon groups or vote to kick other players, the Vote Kick option will be kept on a cooldown. This functionality will adjust itself as a player’s behavior while using the Dungeon Finder changes.
You should probably read the rest of the patch notes also. It’s not like you have anything else to do while the servers are down :-p