They've also created a solo-self-found option for those who want to challenge themselves that way. I won't use it, but it's there
Adding 6 more acts for a total of 10, and removing all but one difficulty level is the biggest thing for me. Looking forward to all that new content, and not having to repeat the same 4 acts 3 times in a row!
They also streamlined the Labyrinth somewhat so that it's not such a randomly brutal and ridiculously long task for lower level players. The first 2 instances are much smaller than they used to be now, and the boss won't have some of the nastier powers that he can get later.
The new MTX interface looks amazing too! I can finally find all my armors and effects and not have to deal with the pain in the ass way we had to apply and remove them before. Best QoL ever!
Ok, maybe not best, almost forgot they also added dynamic resolution scaling now, which gives us a massive performance increase in those situations like groups or really spammy skill builds with lots of environmental effects going on.
"The whole problem with the world is that fools and fanatics are always so certain of themselves, but wiser people so full of doubts." -- Bertrand Russell (I think...)