Update from Screamscape
(1/18/12) SeaWorld San Diego unveiled one of the Manta ride cars at the park a few hours ago and were kind enough to send us pictures of it to share here on Screamscape. The car will remain on display near the front of the park for the next several months while work on Manta continues.
....The park reports that Manta is still on track to open on May 26th, with 55% of the track now installed, and the rest to be in place before the end of February. The station is about 65% complete and they will begin construction on the “launch tunnel / show building” next week. If everything stays on track, ride testing will begin in April.
Here are pics of concept art, track in the process of being installed, and the sit-down ride vehicle: