The Heroes Community have issued a Q&A with the H7 producers. I thought I'd just give you the quick highlights:
* There will be a zoom function in battle mode.
* The map editor will allow mapmakers to use scripts.
* Primary attributes are in.
* Still secretive about the RMG and Sim Turns.
* Unique warfare units for each faction.
* Magic system close to the ones used in Heroes 3 & 5.

Read the full Q&A here.