Hi, thank you for that! I've had my head in the books (literally) for the last few weeks, seeing what I can do. Unfortunately, reformatting the A5 version proved to be very difficult and time consuming, also I didn't like how we were going to lose the two-page spread layout for the wilderness/dungeon/etc. sections.
I know that the A4 version is quite large, so as a compromise I will be offering a 7x10" version (tablet sized) in both paperback and hardcover that is more portable than A4 and much easier on the eye than the A5 version. I will still be offering the A5 version as a mini-travel version, because I know a lot of people didn't mind the text size and wanted a very small book for their solo kits etc.
I have to say though, the 7x10" one is currently my favourite size, and the one I'm personally using.
The last round of proofs should be arriving with me in a week or so, at which point I'll update the links above.
Regarding a spiral bound version, I haven't made any plans for one of those, but I could look into it in the future at some point.
Many thanks again and I hope that you enjoy playing!