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Five. The other two are not being announced yet.
*prays* Elves and Dungeon, please, elves and Dungeon...
In general, I find it amusing how they take everything that's lying around in other games. Oh, King's Bounty has bosses, so we need to add bosses to Heroes of Might and Magic! Oh, Heroes of Might and Magic has a huge battlefield, let's do the same in Arcomage! Oh, Arcomage has only gold as a resource, let's reduce the resources in Heroes of Might and Magic!