So many thoughts...
Practically I think it is more news about the 3 Disney ships that are on the horizon - Adventure, Destiny, and possibly a mention or two about the Japanese one just announced.
However, it could be Magic & Wonder replacements. If they are I think two things:
1. Ships in the size of the original are unlikely given the trends in cruise ship building over the past 30 or so years.
2. Ships lightly themed are unlikely given Disney's obsession with IP at the moment, coupled with the announcement of the new OLC ship.