I'm looking for information about Heroes of Might and Magic V.

Well, I found something. http://forum.ru-board.com/topic.cgi?forum=71&topic=0099&start=20 As you can see, there is one creature and one building in the city. There isn't a complete picture. This suggests that at that time, the game was far from being playable. Almost immediately after the screenshots, there is information about the bankruptcy of 3DO. So, it is unlikely that you will be able to find a beta or even an alpha version, NikBond.