Still, yay for a new type!!!
They said it would be their biggest update so far. Of course that's all relative, but maybe they're going to change some core stuff too, like bigger cash pools in current habitats or new opposite elements. I could happen
We'll probably have to buy our first metal dragon cause if they become a combination (like fire and earth e.g.) that would make the metal dragon available really early in the game, and they will thus not be quite as special.