Dave and Jim,
I was just on the Zenith Nov. 10-14 and had an excellent time. As you know, the Zenith is doing 4 and 5 night cruises to the Caribbean. We did a 4 night that was supposed to go to Key West and Cozumel. It was immediately before Coz re-opened after the hurricane, so instead of a day at sea and 2 days in port, we had 2 days at sea and a day in Grand Cayman. Even better for us! We couldn't stop in Key West because the ship needed the extra time to get down to Grand Cayman.
Anyway, I believe the Century will be taking over the Zenith's 4 and 5 day itineraries next year.