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

1. Most likely, these magic books will either give him counter-magic against all spells or be completely useless!
2. I think they won't leave the Elves in the lurch and will make "Avenger" work on all units at once!
3. I think knowledge will grant mana for summons! And spellcasting will make summons stronger.
4. Probably living, or maybe dead.
I wish they would release the skill wheel soon. Let's hope they release it immediately after the game or at the same time as the game. :)