I'm actually hoping that the art in this is as minimal as possible. Maybe just a portrait of each king at the start of their sections, with maybe a few other decorative pieces. A ton of new art translates to higher possibilities of the book getting delayed. The bulk of the writing for the World Book was finished by mid-2013, but it didn't come out until late 2014, partially because they were waiting on so much art. I seriously, seriously doubt the book will be that thorough. A full list of Hands seems doable since we're already most of the way there. Complete lists of Kingsguard is, I think, beyond even Martins powers and interest when it comes to world building. In the entire 290 year history of the order we currently have 68 named or identified members. That's probably not even scratching the surface. I wouldn't be surprised if the total number of knights that served in the order was 200+. There's no way Martin's coming up with that many names and bios. Let alone the headache of organizing them, who died when, who replaced who, etc. I'm one of the biggest Kingsguard fans out there but I'd settle for a list of Lord Commanders at this point. That at least seems doable.