Summary: After the relative reveal of 1 of 150 cards in the earlier post, some players became concerned that closing gap between factions are not so great ideas. Here is response from the design team. (Great one).
Each class has their strengths and weaknesses, and each faction does too. Shadow will retain and have even more “shadow” flavor, human’s will retain and have even more “human” flavor. The expansion won’t make this gap smaller, but wider. More distinction between the factions, and the classes and yes: also between the heroes themselves (so heroes that are in the same class will also start to feel more different from each other). I can assure you that this is a major component of all the hours of card designing I’ve been passionately busy with.
If a class or faction gets a card that deals with a certain “situation” (like the 4cc artifacts/items example GDC spoiled) it will be in the “human-way” and in parallel to it, the distinction between the factions and classes will be only further increasing, not shortening. To say that a card is OP because of what it does, without even knowing how it does it, for how much cost, and in what conditions… is premature. Plus, as iClipse said, there are 150 cards in the set.
150 cards is essentially as if you take the core-set and you double-it, since the core set has heroes and “foundational” cards. The expansion can just go wild on-top of the foundations and thus the level of card synergies. Interactions and new deck-builds will surely be an exponential-factor of Call of the Crystals. My personal goal is that all heroes jump from their current 1 to 3 viable-builds, to countless competitive combinations with lot’s of diversity and dynamic combinations/interactions — for all heroes, and with even more “faction/class/hero-distinction” than ever before.
Comment: One of the reason why Shadow Era is played by so many people and people continues to come back despite relatively small sets of card pool, I believe is due to the fact its Faction/class mechanics. Since choosing your hero forces you to use only subsets of card, at the deck building level the game is ensuring existence of at least 20 (# of heroes) different types of decks. So when you go to online and play against each other we don’t get bored with seeing same decks over and over. So making each faction/class identical is non-sense, and perhaps even ruins the game strength. But response from design team as stated above simply confirms our concern is for no reason.