Of the 6 cards we've gotten so far, I think 4 of them will see pretty consistent use. Anub'ar Ambusher is a great powerful 4 drop, especially for Rogue, who's all about abusing battlecries. Poison Seeds is also nice for Druid as finally a source of hard removal, although the card has downsides, such as the fact that your opponent can use their treants right away. Still, Poison Seeds + Starfall sweeps, even though I think Starfall is a bad card, it might be important now. Maexxna is really cool because with 8 Health, it is almost definitely going to take 2 or 3 cards to take it out, or it absorbs a Silence, while continuing to munch on weaker cards. And Nerubian Egg is a great aggro card, most fast decks have a way to activate it, and it also deters AOE and gives you strong presence after a sweep. I think this will take the place of Harvest Golem in aggro decks, I think it's better there.