Heroes 6 - Discussion

What new features do the 6 heroes offer in terms of gameplay? Where are the new, interesting ideas? So far, only boss battles can be considered a positive addition, but I can't judge them yet, as it's unknown how they will be implemented.
And that's it?

God be with you, there are still new features. For example, the blood and tears system (when entering a battle, you gain blood experience points, and when letting enemies go, you gain tears experience points, and depending on this, you gain access to skills of a certain direction), the ability to convert cities (you conquer, for example, a human castle, but you are playing as demons, and to increase your army, you convert this fortress into your own, gaining the ability to recruit your own units), the introduction of a new faction, the creation of many completely new units... I think there is enough new content, and the game has undergone certain changes.