"This is an interesting link between the future of HoMM5 and Dark Messiah. You can see the loading screen from DM next to the map of Ashan from Heroes 5. There are Stonehelm, Heresh, the kingdom of the dead and the capitol city, the orc temple from DM and the orc island. At the end of the campaign we learn that Raelag will go East, and there we will see the new race in the new Addon. Some say Nagas, others orcs, I think that this is good proof that the next race will be the Orcs." Vokial has a more detailed analysis of the future of Heroes on his site.