From the announcement:
The Armies Of Late-War cards, book and army deals mean that it is a great time to start playing Late-War either for the first time or to dust off an existing army.
The Armies Of Late-War book and card packs will help you keep playing your existing V3 Late-War armies with the new V4 Rulebook. The points are all comparable to existing V3 army books but the stats and lists have all be updated to the V4 rules. The book covers all of the most commonly used formations and models in Late War and is a great starting point and if you found the unit cards from Mid War to be useful then the Armies Of Late War Card Packs contain the unit cards for the models in the Armies Of Late War book.
The four Army Deals are excellent value for starting a new army or adding to an existing army. Each box is packed with models that will form the core of any army, as well as the appropriate Unit Cards, a Start Here Guide and Flames Of War Rulebook.