Some time after I read the campaign book topic, this came into my mind while I was riding my bike.
Why not have a book about Uchronia (sorry if I spell it wrong)? We are expecting Heroes and some new races, and this kind of book could be the foundation for the realm of BattleLore.
Some ideas:
1. A map of Uchronia split into regions, depicting what kingdom and nation in each region. Then a bunch of important battlefields in the history of Uchronia. The book will have map setups for the battlefields. Each map will have a recommended race(s)--probably there was a great battle of elves and men in the ancient days, and between ratmen and torks recently--and deployment, but will always be available for Call to Arms games. Some narration accompanying the recommended battles is always a good thing to have.
2. Campaign system, using the aforementioned map and battlefields. Player will fight battle that will decide the outcome of war. Put victory tokens in different region and gain different advantages in battle.
3. Heroes, great battles, and history of Uchronia!
I know this could be a hell to develop, but I can always hope