The only thing anybody knows is that they'll all be released in future sets. The playtesters probably have an idea of which sets each card is in but they aren't allowed to talk about it.
I've had some concerns about Ballista. We ended up holding it because we wanted to take a closer look at it.
Without my black cofee i aint no morning star! Funny thing is, i already finished creating my new spellbook. I am just waiting for FiF to put those cardsinto spellbook