Woah. This part answers a question I had been wondering about: Harumi's secret is still a secret.
I got distracted so didn't post then, but at the time I remember thinking, "Yeah, crazy thinking on your part; it's also true." when the outside-the-loop gal had her thought concerning Harumi seeming like the Silver Princess.
As of right now there is no information on when it will go up for pre-order.
Just a observation but they are probably using all their spare resources on completing the Rokujouma Kickstarter, and then will focus on releasing the other volumes after the fulfillment or when it is close to being fulfilled.