aside from how much of a frankenstein job they do into the initial release - an equally big danger is how much they then incrementally nerf/trivialize it over time to try to bring in more and more 'accessibility-oriented' customers.
I bet they build the classic into the current engine with ALL features itegrated (from petbattles to LFR), then just turn most of them off for release and gradually turn them on 'because the players demand it.'
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We were just discussing problems with a lot of zeros in numbers when you came in. My prediction is on record (largest wow iteration launch ever meaning most players playing on classic servers within x days or weeks of launch of any launch cycle ever, EU/NA>). Could you share yours with us?