Disney has released some of their plans for when the new ships start to arrive.
Wonder will be based on the west Coast. It will be doing Alaska cruises out of Vancouver, and Mexican Riveria cruises out of LA. It will get an update to protect passengers from the iffy Alaska weather
Magic will still be be doing Caribbean cruies, but will be spending the summer in Europe.
Disney cruise lines: Disney to spread cruise ships around the world -- OrlandoSentinel.com