Heres my predictions till 2025, much more "six flags" friendly.
2018: Giant Discovery, Baboons Return to the Safari, Fireworks maybe every Friday night in the Summer? Relocation in the park of the Jolly Roger ride. Bonzai Pipelines at HH. The Panda Express turns into Chop-Six
2019: GA's 45th Anniversary, nothing too major. (ik, but, you'll see). Splash Golf to Hurricane Harbor. New Show in the movie town arena, movie town gets rethemed to Gotham City (including Old Country area). The Jolly roger spot will turn into an outside seating area for the Chop-Six.
2020: T-Rex Coaster where Autobahn and those buildings are.
2021: Safari Kids turns into DC Super Friends, removal of the paintball building (thats right, I think it will take this long xD)
2022: New Thrill Ride by Bizarro, maybe a pipe scream type ride. Sky Ride M&M trains get an 80 under all logos for M&M's 80th Anniversary.
2023: GCI wooden coaster.
2024: Removal of Tango.
2025: Premier Rides launch coaster.
(Sorry if the things past 2020 are pretty bad predictions)