Heh, yeah. The update is now publicly available. :)
Regarding your question: It's really hard to say and ultimately depends on whether I decide to make a sequel or end CH. If it's the former, the game could be done in a year or so. Otherwise, it's probably going to be another couple years at the least.
Or, in other terms, there will be at least one more chapter, and at most.. well, the sky's the limit, I guess. Technically, I have enough ideas and story in my back pocket to fill another 6-7 chapters, at the very least.