I remember briefly looking at this game years ago, but it suddenly popped up as a recommended game title on my Steam homepage. There however, it is shown as "Coming Soon" for a release date. I'm wondering if the Steam version is going to just build upon what is already presented in the original game, or if it's going to be a complete overhaul with new mechanics.
I honestly wouldn't be that surprised if the developer(s) decide to add their own reverse-engineered versions of the material released with the 1.4 Arenus Rabbitmod available here. This is all speculation of course.