What changes May 15 on Caribbean deck plans?

[Aquarian]

When I sign on as a booked passenger on the Princess website and go to the deck plans for Caribbean Princess, the website prompts "sailing between now and May 15 or sailing after May 15" before it shows the deck plans. Does anyone have an idea as to what changes in the deck plans on May 15? We are sailing June 21.

[USAF Retired]

The Caribbean Princess goes to dry dock in early May and starts sailing again May 15th. During the dry dock they are adding 4 inside cabins on the Caribe Deck. Not certain what else is being done during dry dock.

[Aquarian]

Thank you!