Here´s a snip:

GameSpot: Heroes of Might and Magic IV will follow in the footsteps of its successful predecessors, but it looks to be significantly different in several key areas. What do you think is the biggest difference between Heroes IV and the previous installments?

Jennifer Bullard: Heroes now actively fight on the battlefield. Previously, heroes lent their support from the sidelines and weren´t all that different from each other, but now they are part of the army. You can also have more than one hero in an army, so you could very well have several heroes on a battlefield, working in unison. With this change, players are going to have the opportunity to see if their knights can really kill a black dragon or if their necromancer can take down an angel.