The pass only makes it so that people who got the pass can play as the classes a week before non-pass holding players. After the week passes, they're going to be available for other players to purchase with in-game currency. It doesn't say that's how it's going to work specifically anywhere, but I honestly don't believe that they would make you purchase the new ones when they've already announced that all dlc will be free. It is free, but those who pay for the pass get access to it a week early.
A lot of redundancy in this post, but that's perfectly fine.
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