[quote author=Kaida Spirit link=topic=12509.msg166471#msg166471 date=1252622823]
isn't that what the books mostly are anyway?
[/quote]
Depends, as the description of the book is loosely speaking "With precious establishment images along with the story, look back on the passionate history of the partners and their Digimon!"
You can almost expect recaps of the seasons, character bios, perhaps explanations of various image material. There can be any amount of text to go along with the images. I mean if they want to explain backstory and stuff not directly presented in the anime, the thoughts of various cast, directors, etc, there could be considerable amounts of text.