If things go smoothly, the first part of the update should drop this month. We will be doing it in two parts, because the changes are simply too big for a team of two to reliably playtest in every capacity. We hope to drop a pre-release version first, with all the new engine, interfaces, and back-end changes, while we continue working on the content part of the update. Once that's done, I will go back to fixing all the bugs reported by the community and drop part two.
P.S. I mentioned it in one of the devblogs, but to reiterate; Interfaces were the third and last part of the game that required a major overhaul, once that's complete, it's all smooth sailing from here, and we will be focused purely on content updates - CGs, Events, and character development.
P.P.S If you're impatient, you can always grab the latest developer build from our git repository, there are instructions included.
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(Just make sure to select the correct feature branch)