It's just a rough guess at this point, but based on current efforts and the order I have things planned, I would say probably sometime this summer. I'm currently working on migrating all of the existing functionality over to Godot 3.0, so unfortunately there won't be any new major features until I get through that. At this point, I am thinking that effort still has a few months of work left. After the migration is complete and I get Steam Early Access launched, one of the first things I'd like to focus on is building out the combat systems more!
The move to Godot 3.0 is taking a while to get through, but it's going to contain a lot of nice little improvements to the editors and I think it will be worth the wait. :)