Heroes of Might and Magic V [Game Discussion]

In the biography of one of the Necromancer heroines, it is mentioned that she was trained by Sandro. Additionally, 3 human heroes are clearly from the original game, but in the beta, they have different names (a few letters have been changed). I'm talking about Christian, Tiris, and Orin. I really don't like this... If they said that the world of Caningham is dead, then why revive a number of well-known heroes in the 5th installment?