886677:It would also give us 2 of each class
It would do for the TCG what BC does for the MMORPG, give both factions access to the same classes. So it's the perfect parallel. If they don't do this I think they need to fire the marketing department. As far as promotion is concerned, both for the MMORPG content and for the TCG, having a BE and a D hero is 10 times more effective than having any other random Horde and Alliance heroes.
886677:. As far as what cards you'd include as foils? Who knows? Game companies sometimes have some really odd choices of what and what not to foil. I agree the Heroes would make the most sense, but there's no guarantee that it'll be them that get the foiling.
While I'm speculating, my guess for the 3rd foil is a neutral ally with a loot code on it.