Serus
Arcane
I'd imagine something similar to TOME's infinite dungeon mode. Randomized level layout, random item drops, random enemies that get picked from stronger types as you progress. Eventually once you reach a certain point, the enemies start getting additional bonuses to their stats. The goal is to see how far you can progress before you get killed. Though they mention a "unique boss", not sure how a boss fits into an "endless" dungeon. Perhaps it's not endless after all, just randomized each time you enter it but still has an end boss. We'll see.Endless dungeon? Not sure how they can make it.
If done right it could be a fun change of pace but I'm almost certain they will make it half-assed. It would require a tremendous amount of effort to make it good, I doubt they will have the man/hours to spare for that DLC but I like good surprises.