Carnival Inspiration new itinerary?

I am sailing on the Carnival Inspiration May 9th. Instead of going to Cozumel, we are not only going to Grand Cayman....does anybody know how this works?!?!?! Are we just going to be docked there overnight or what? I want to plan an excursion but i dont know what times we are going to be at grand cayman....and everytime I call carnival i am on hold for so long that i never get a chance to talk to anybody.....