So a little bit of backtracking research, initial local government plans for major rides at both Tampa, Williamsburg, and some of the SeaWorld Parks have been filed in January, February, or March the year prior to opening. For instance:
- 2004- SheiKra (Intial permits on March 30, 2004)
- 2009- Manta SWO (Intial concrete info first unveiled in April 2008)
- 2014- Falcon's Fury (Initial permits on Feb 22, 2013.)
- 2016- Cobra's Curse (Initial permits on Feb 5, 2015)
- 2017- InvadR (first teased by the park in March 2016)
- 2018- Electric Eel (first unveiled on January 3rd, 2017)
- (scheduled) 2020- Pantheon (Initial site plan in Feb 2019)
- (scheduled) 2020- Ice Breaker (Initial site plan in March 2019)
- (scheduled) 2020- Emperor Dive Coaster at SWSD (Initial Announcement in January 2019)
And for what it's worth, Tigris was permitted in June 2018 for a 2019 opening. It seems like Iron Gwazi and Serengeti Flyer are the two main exceptions, so it does seem possible- even if not likely- a decent coaster could still be in the cards for 2024.