“Heroes of Might and Magic V: Tribes of the East”

I have some questions regarding the 2nd expansion pack: - What will happen to an Orc hero with the artifacts "Book of Light", "Book of Darkness", etc.? - What will happen to the Sylvan faction ability "Avenger", since we now have 2 upgraded units? - Will knowledge grant mana to Orcs? - How will the transfer of Goblins by Cyclops be implemented (using corpses, as in Dark Messiah)?