It's called SeaVenture .... here's the link:
http://www.discoverycove.com/Explore/ExperienceDetail.aspx?name=SeaVenture
Its an extra charge on top of your day package admission.....we thought it looked great, but figured for our first trip, we'd be busy enough with all the other things to do (including the dolphin swim

) that we'd forego the SeaVenture experience. It does look amazing though!