Yes. The official announcement should be soon™.
Actually, we hope to have an official announcement regarding the release date of the official announcement sometime soon.
Yes, Book III is absolutely coming. Yes, an announcement is coming. The reason for the delays in any new information is "growing pains". Ongoing support of existing titles and customers eats up time, dealing with distributor requests takes time, moving the studio took
time, and working with additional people (who sometimes just drop out) has taken a lot of time. It's not like back in the days of Book 1 development when 100% of our time was spent on actual development.
I've mentioned before that we are doing a "summer crunch session" to get development caught up. We do promise to have more info....soon.