You may get better response on the Trip Attractions/or something like that board... (can't remember the name)
I did hear a while ago, that Dolphins in Depth was suspended because of a sickness/death (?) of one of the dolphins.. that was back in the summer though.
If you really want to do dolphins, I would strongly recommend Discovery Cove... its an amazing place, you get to swim with the dolphins, and enjoy all sort of other marine creatures as well.. plus all equipment, (wet suit/snorkel/mask) are included, as well as LUNCH and parking, AND last but not least, SEVEN FREE DAYS at Seaworld!