There will be a rolling server that launches parallel with the current blue server. This server will start from the beginning and work its way to the end of velious where characters will get merged into the current blue server and the process begins over again (kind of like Diablo 2 ladders, not sure how Diablo 3 does it).
They did mention custom content that can be added which is in the spirit of classic so dont expect a new class or anything like that. Maybe a custom zone or very rudimentary AA's or something - who knows.
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