Don't expect CF to do any major park expansions for a few 2026 World Cup Games to be played in some of these markets.
For KBF - there's no room to expand and the park isn't that close to SoFi Stadium. There are also way too many tourist attractions in Southern Cal so they'll have plenty of options for doing other things. If they're gonna go to a park, they'll be visiting the Disneyland Resort over anything else.
For CW - this is the company's most visited seasonal park annually. They get the constant gate numbers every year so if they get a major attraction it'll happen because of that and not the WC.
For CGA, did you miss the announcement that CF is selling that park? It might not even exist when those games come around so don't expect them to add anything at all.
For Dorney - the park is not close enough to Philly to draw World Cup visitors and they'll have better options either visiting Great Adventure or Hersheypark, or just doing other non park attractions around the area. The park doesn't have a lot of room to expand and hasn't had a brand new roller coaster installed since Hydra in 2005 and that was built on the former Hercules site.