There was a community Q&A with Nival's Old Boy on the Nival forums, in Russian, on March 6. It was translated to French by Winfola of Heroes-fr. Here is my own quick list of changes that are being considered for the future, as well as changes that are not likely to become a reality:

Possible New Features	Things That Won't Happen
Kingdom Overview	Nagas and Crystal Dragons
Hall of Fame Facelift	Fog of War
High-Level Adventure Map Dwellings	Speed-Reducing Spells
Faction Balance Optimization	Visiting Allied Towns (for spells)
Ability to Teleport Enemy Units	Campaign Heroes for MP

Please keep in mind that this information was translated twice, so there is a risk of error. Perhaps our Russian-speaking readers could tell us more about what is being discussed in the original forum post -- feel free to post a comment.