How about:
- More pages then previous books added together
- Updated rules to included all the new abilities and rules, perhaps a complete rules section with new examples
- Pictures, not only Mike's drawings (which are always great) but actual pictures of miniatures
- Fluff of course
- Entry section for each faction
- Page or two dedicated to the colors of WoT
- A few pages dedicated to Terrain building
- Senarios
Sounds like a big book, close to 100 pages