My feeling is that they're moving the WBPC 2019 trip up (full disclosure we're taking that trip!) by 2 full months is in order to give the Wonder 2 months of itineraries on the West Coast to gauge the ability that
DCL can fully book the ship for the 14 itineraries that they have slated for that time from March until she departs for Vancouver and the Alaskan coast season. I'm guessing that they want to see if it will be worth basing the Wonder (or any ship for that matter) on the West Coast permanently and be able to sustain adequate bookings while she is there. In addition, even if they do base the Wonder on the West Coast (either San Diego or hopefully Los Angeles since it's closer to Anaheim and
Disneyland) it would give them the ability to do Mexican Coast cruises, or cruises north to San Francisco or even up to Vancouver, as well as doing quick stops in Ensenada and then they could go to Hawaii multiple times. On top of that with the NEW ships rolling out eventually they could still continue Panama Canal crossings since they're a very popular itinerary with one of the Dream Class ships or even one of the new ones. Granted this is all speculation, since we don't really know what their plans are for the new ships, although I have heard from someone sorta connected that has said that DCL is going to design one of the ships for the Asian market. I'm just not sure where and when it will be based.