From the announcement:
War Room, the first official utility app for the WARMACHINE and HORDES tabletop miniatures games, is now set to release in late April.
War Room will be available for iOS and Android devices and allows users to reference WARMACHINE and HORDES stat cards and rules, construct army lists, and track damage and status effects in game. It is free to download and includes stat cards from WARMACHINE: Prime Mk II, HORDES: Primal Mk II, WARMACHINE and HORDES starter products, and a special selection of additional cards from the Retribution of Scyrah, Mercenaries, and Minions factions. Additional decks can be purchased in the app for $6.99.