When I talked to the ladies at the Turquoise Reef Group in Summer 2008, they said weddings weren't being booked beyond Spring 2009. When we were visiting Shangri-La Caribe in December 2009, we were told by the staff at the front desk that there were no plans to shut down and there have been rumors in the past few years about that.
Mexico Beach Resorts and Hotel Reservations - the Turquoise Reef Group
The best thing is to contact them again to confirm one way or another.