Hmm, by scale do you mean timetable for its release or do you mean how much content there will be?
If it's release date you're looking for, I'm afraid I have no idea. I might have the more difficult programming elements done, but I still have a lot of writing and art stuff to do.
As for content, I can't imagine it'll be much longer than the base game. I hate to feel like I'm leading people on with some kind of HUGE GRAND ADVENTURE type thing, but in reality it just hasn't been working the way I want it to.