Wife and I are on that cruise. If you are really interested in joining the cruise, hop over to the cruise meet thread and post there. People are constantly watching for cabins to open up and while they don't post much, would probably let you know if you ask.
This WBPC does stop at CC, which is new. It's also sailing during spring break for some schools, so will likely have more kids that usual for a PC cruise (so I'm told). The WBPC cruise offers a unique opportunity to visit the Disney parks on both coasts. Some on that cruise are making it a 3 week vacation and spending a few days on both ends. Wife and I are spending one day at WDW, but have been to
Disneyland so often, we're just coming home after the ship docks in San Diego.
Opening day pricing is much more reasonable. We have a verandah at far lower than the $11k Oceanview. That's just for two of course. I'm sure that as we get closer to PIF, more cabins will open up.