It's pretty traditional for Cryptic to include a new dungeon and/or trial (raid) with each new module. From what I can tell these are actually always pretty inventive and well done, but since the difficulty is tuned for players at the very top-end, I tend to not see them until a few years later, once several new tiers of gear allow you to overpower the fights a bit.
I've been pretty stern with my guildies about not even wanting to bother while a dungeon is still hard (too many bad experiences), but today I allowed them talk me into running Tomb of the Nine Gods (released in 2017) and Castle Ravenloft (released in 2018). Tomb was actually pretty fun and not too tough anymore except for the last boss being somewhat manic. Castle Ravenloft was still tricky though, especially the last boss. We persevered though and eventually downed him after a number of tries. By that point, everyone apart from the tank had died 20+ times. Still, it was an adventure with friends and we enjoyed figuring out the tactics together, so it was ultimately fun. I uploaded our final fight against Strahd to YouTube:
I wouldn't want to go again any time soon though.