Dion
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Gentlemen, let's differentiate the concepts. The game is being made based on the gameplay of Heroes. With significant changes to the gameplay, but the foundation is largely preserved. Based on this, the game has the title Heroes of Might and Magic.
Attempts to connect the dragon gods with the great egg (or whatever it is in the cosmogony of parts 1-4?), demons with Krigans, etc., would result in a terrible mishmash that neither you nor I, nor anyone else, would want to eat – fans would be disgusted by the taste, and newcomers wouldn't understand the convoluted plot.
Furthermore, there is copyright. There is a series name. Making a game "Might & Magic: Heroes 6" or making a game "something-there 1" are two very different things.