So I've been doing a little digging and thinking about what the park could be up to for their next major project. Everything is pointing towards 2019 as we know that SeaWorld Orlando and San Diego will be getting the cash in 2018 for Infinity Falls and Electric Eel. Also, if it were for 2018 it's likely we would have seen some sort of permits by now. I'm reliably informed that RMC Gwazi is highly unlikely to be happening as the station and queue line have suffered severe structural and aesthetic damage and have been completely neglected. Last year we got a great family coaster with Cobra's Curse so it's likely that BGT will want to up the thrills again as it will have been 5 years since the opening of Falcon's Fury. A giga coaster would do this for sure and is a suggestion that has already been talked about quite a bit. SeaWorld has a good relationship with B&M as well as Intamin, both of whom could manufacture such a ride. Also, the park's two SBNO attractions (Gwazi & Tidal Wave) line up perfectly for a great out and back giga layout similar to Fury 325 or Leviathan as shown in my very basic visualisation below:
Of course we can only hope, but with RMC Gwazi almost entirely off the cards and this new space opening up, a giga coaster seems like a logical choice.