I don’t think they’ll wait for the treasure to release summer. I think they are trying to settle on prices for 2024. Some of the europe and alaska cruises have gone to GT rates which may be a sign they overpriced them.
My bet for the treasure is 3/4 nights from PC. They make more money on the short cruises and it allows more people to experience the new ship—first timers who might not want to spend a whole vacation on a cruise but are willing to tack on a 3 or 4 night cruise to a stay at WDW. Plus it will be easier to run more ships in the Bahamas at the same time once they open
lighthouse point.
I could also see Dream or Fantasy going to Alaska someday. Those cruises are big money and they can sell more cabins on the Dream class than a classic ship.