In the rulebook, on the bottom of page 4, it says:
A note about multi-player games: This Player's Guide introduces BattleLore primarily as a two-player (or two teams) game, with each side leading one of the two warring camps. While some components (cardholders, and the reverse side of game board for Epic Adventures) are designed to facilitate larger scale play, these additional capabilities are beyond the scope of this book and the core game. For additional details on multi-player play, please visit www.battlelore.com/epic and www.battlelore.com/heroes
Which means that the heroes expansion would be directly related to the multi-player aspect of Battlelore. I myself have always found it much more enjoyable to play one-on-one rather two or three on each side, since I'd rather have control over my whole army. I'm hoping the heroes expansion will somehow allow people to join in the game, without the commander having to share control of one or more flanks; that the heros will be able to maneuver independantly from the commander's orders.
What do you guys think?