Will there be any expansions for Heroes 5?

It’s interesting to know how many new cities will be added to the game. There are four potential candidates: Orcs, Gnomes, Swamp Creatures, and Elementals. For some reason, I think the last ones will be left out, as they look quite strange. They put Hydras in the Dungeon, and a swamp without Hydras is… So, it seems that it will be Orcs and Gnomes (or one of them).