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His Excellency truly provided the most accurate account of the ancient Ashan. So, I don't think there's any room for further discussion here – there's no need to create a thread about dragons.
In Heroes 6, dragons primarily give us hope to see factions from Heroes 5. Perhaps more will be revealed about them, and perhaps they will indeed play a role in the plot (remember the appearance of Arcat and the voice of Erathia from Heroes 5).
I also assume that the dragon bosses will look the same as the dragon gods. Again, remembering Heroes 5, Arcat looked exactly like a dwarven lava dragon. As a result, these artworks have a double meaning: they also show us the future bosses from the game.