from what I have seen there will be character cards that go with each figure that has their basic stats on them, and then there will be ability cards as well for the different classes. I am assuming we will be able to use these to customize how the figures play.
Also unlike a card game where you put x number of cards in a deck always, with the minis game each figure has a point cost based on how powerful the figure is, so when building your army you have to take that into account because you will only be able to have so many points worth of figures most likely.