What else are they planning on adding? I've only watched a little bit of people playing on twitch so I don't know what all there is to do but it seems a lot less to do than the original.
More "run" versions, but not sure if they have said anything about what, if anything, changes with those. It starts with Denial. I assume that it is a reference to the five stages of grief, so Denial (and isolation) followed by Anger, Bargaining, Depression and Acceptance. Most likely each run is the same type of going towards the mountain, but with different bosses at the end.
Current progression is unlocking new items (and classes) which can appear in your run + adding the new skills to the characters. Other than that each run is completely independent. While you do level up skills by doing the story for the classes, it does feel odd as you get a personal story level up, die horribly, then next character progresses for the next story part. There really isn't any attachment to anything at all.
Something they could do that would at least add some meaning to naming characters or feeling like they completed something is if you complete a run in one act, the characters that survive could be chosen for the pool of characters for the next level run. Or at least be added to a random pool. Would add some incentive to building them and going to hospitals, removing traits and the likes. Say you're struggling in the Bargaining level, then when starting a run you randomly get a previously upgraded character that survived the first two runs and has the mastery points that you gave it. Once they die in a run though, they are deleted from the pool. Would give some incentive to going back and completing the previous run levels as well to build up a possible roster of characters.
Curious how they will do it. Currently it's kind of bare bones if characters only have one level for skills, with no armour or weapon unlocks, then deleted as you start a new run. With no progression, why would you ever run Denial again after you unlock the next tier?
Unless they plan to make you always start in Denial, and the rest are acts that follow until you either complete all of them or wipe.