I'm not sure if they are building anything new, but when I was passing by Seaworld I saw the Sky ride vehicle stuck at the top of the sky tower. I am not sure if it is a test or not.
They have more shows now than you can watch in a day. Do you mean new shows to replace some others, or just more so people can have more variety to choose from?
Sea World San Diego has Shipwreck Rapids,which I went on last time I was there. It's an ok ride,maybe a copy could be in the works or a new kind of rapids ride. All the other Sea World parks recieved R.L. Stine's Haunted Lighthouse 4-D,but Busch Gardens got it and I believe Sea World should have recieved it. Sea World San Antonio has THREE coasters. SWO should at least get another one.