From the official WarriorElite newsletter (summarized):
War Unleashed - the companion to War for Edath.
Battlefield rules - now you can battle over large battlefields for the full tabletop, battlegame experience where strategy in deployment and movement is key - many Terrain Maps (battlefields) will be available free to download online & others will be included in future expansion packs.
The Art of War - campaign rules where you'll compete over a region of Edath. Includes gaining experience and 'leveling up' troops, champions & leaders.
The Art of the Master - expanded rules for Combat & Battle Masters that unleash their true potential. Includes skills and is the basis for having characters in your games.
Background on the World of Edath is also contained within War Unleashed. A map, history, world details, Edath's species, the warring factions, countries of Edath, the Dzaa Empire & the Supernatural - including magic - are all covered.
War Unleashed comes in paperback, A5 format - 144 fully illustrated pages and an 8 page, full-colour section of artwork.