Sorry that the hardcover edition has taken a while. To be honest I shelved the idea because I wasn't 100% happy with the quality of the proofs I received at the time. I might look into getting this back on track and see whether the quality has improved now that it isn't peak printing season. I can certainly look in to doing a coil bound version too, even if it is just for the 7x10" or something.
Now that I think about it, the hardcover print issues were with both the A4 and A5 versions, the 7x10" hardcover actually came out nicely, so it might be that I just make that one size available in both coil & hardcover, with the other two sizes paperback only. I'll look into it! :)