Apparently all the current WW history is still there, Diana is just working her way back. All that seems to sound like a convenient fail-safe in the event people end up hating the new stuff. "Oh well, the timeline is fixed, yay, classic WW is back!" Or if it resonates they'll fold this urban WW into the DCU proper.
To be honest the whole premise of a city raised Diana would actually make for an interesting movie or live-action TV show.
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