It’ll certainly be at least a skin for each character, if I were to hazard a guess I’d say:
Waystalker (confirmed)
Merc
Slayer
WHC
Necro (very unsure about this however Siennas other classes have 2 DLC skins already)
My guesses are based off classes that only have 1 or 0 DLC skins, this however isn’t assured as Handmaiden now has 3 skins and SOTT and Necro have 0. Wish that they had kept the skins even across all the careers but oh well. I’m just keeping my fins crossed for a certain fishy hat this Mondstille, unlikely but a dawri can dream can’t he?
The outfit Kruber has in the launcher looks like fur pelts. Could be mercenary, but that looks way more like a huntsman’s outfit. Maybe it’s not a new cosmetic and just some art because it isn’t a detailed image and the design is a bit bland, but Mercenary could use another good outfit for sure. There should be many options for what a Merc could wear with so many imperial counties and so much heraldry and lore there.