they have mentioned it on their discord and also the steam forum, zetheros tend to make a weekly post on steam about some of the stuff theyre working on that week.
There are multiple things that is being worked on for the next updates; improvements and new tools for the game engine, maps, reworking weapons, animations, playable instruments, improvements to ai/the role system and dialogue, mind thaumaturgy and so on, its what i can remember on the top of my head at the moment.