Cygnus Awakening - Southperry Sneak Peak

The original CWK can still be accessed in New Leaf City.

But, another version of CWK will be added in this update. This new version of CWK and its party quest is a theme dungeon and can only be accessed through the Mirror of Dimension. Its story line is different than the original. The original CWK remains intact for now.

GMS could possibly edit the storyline to make it tie into the original CWK's storyline. I don't see it happening though.