Honestly I have no idea. I've just been working on it in my spare time over the last year. Could very well be another whole year before I think it's "done". Best I can tell you is like: by summer 2017, it would be nice to be able to get it up up on Steam Early Access... but that totally depends on how far it's come along by then.
I was (very naively) thinking back in the summer that I might try and get it through Greenlight before the end of 2016. That obviously isn't going to happen. There's a few more major chunks of the "core game" that I still need to figure out and implement before I think it'll be ready for Steam.