Sci-fi is for plus, UI is for plus, but I wonder will it have even remotely the amount of complexity (and thus possibilities) of DF?
I think it's definitely on the right path. You can see the developers daily changelog[1] and there's also a great modding community already started[2].
[1] https://docs.google.com/document/d/1_rCdGYp3nbSUXFG4Ky96RZW1...
[1] http://rimworldgame.com/