[ArkhanTheBlack]

How are the classes and the races connected? Both Baron and Necromancers sound like human leaders just with opposite alignments (Good & Evil).

Can units get better besides giving them equipment. Most games use experience for that, though Dom3 doesn't have experience. Another, much cooler way would be something like Thing of Unreason eating units or a specific resource and getting more powerful from it.
That would make units more unpredictable if they can vary a bit in power.
(Anyone remember the crabs in Magic Carpet that could turn to Monster Crabs and multiply if they eat enough mana?!)

How dynamic is the environment? I heard something about death mushrooms growing on ancient battle fields. Is this static (=never changes) or can the field grow and spawn bigger more dangerous mushrooms like a mushroom mother if you don't clean it up in time. Would make things more interesting if you really have to care about the developments in your environment.
However, I'm aware that a 'living environment simulation' is not an easy thing to do.