The redone Catacombs are neat. Here are some bugs I found, though
Marketplace: Multiple of the red platforms that look like sideways blinds in the center of the market have their elevations off, and are floating in the air or in the ground.
Library Archives: Lots of leftover heroic Rotting Zombie variants in Library Archives on epic. The blade trap at the third Duality fragment on epic is scaled for heroic, doing <10 damage to me on epic elite.
Dryden Family Tomb: Some leftover heroic Ghouls, the NPC at the end states the dialog from the public area if you don't have the quest chain yet, if you speak to him after turning the quest in. He should have a different dialog line, perhaps suggesting that you leave the tomb.
The Patriarch's Crypt: The "Defeat Undead Rat Swarm" objective didn't complete after I killed them. The objective is called "Defeat the Ghouls and Ghasts", but there are only Ghouls, no ghasts.