Thats balancing. They dont have to know all that for designing the bosses in the first place.
Class changes is being made in patches too, while they are working at new instances. Would be pretty impossible to ever make any raid stuff if that team had to wait for the class team.
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Well, first we don't know when the interviews happened.
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Plenty of sites have mentioned they were going to Blizz a week or so before all this information was released, it seems like a fair bet that most of the interviews and new info is from that visit, but of course you are right, we dont know it for every single interview.