Nival is no longer involved in the development of Heroes of Might and Magic VI, according to a wild rumor on the official forum. Vague hints seem to point to a new developer from Hungary, but it could take quite a while before we get any additional information about the situation.

I think Nival did a good job, considering the expectations that came with the Might and Magic name. But they lost much of their initial support from fans with each patch that was released... or delayed.