According to Screamscape, the new coaster for 2018 may have been leaked. Apparently it will be a "Tempesto" compact steel launch coaster.
http://www.screamscape.com/html/seaworld_california.htm
While it looks like a fun ride, really wish we could've gotten more. I am curious as to how they will have gotten around the 40ft height restriction.
Have they already decided what they wanted to use the space for? That could be enough room for a descent Intamin Blitz.