It'll release with about the same amount of CG as were planned initially for first release, around 8 or 9. There is quite a lot beyond that planned eventually, this is already the "basic" setup, enough to have fun with to start out.
To get the initial release out? Like I said above, probably another 4 to 5 months, give or take a little. To fully finish and fill out everything I want to on Chapter 3? I'm not even going to try to estimate right now. I will say Chapter 2 was at least an additional year of new content development after release, and 3 is considerably larger.