I think they clarified that they are staying as Thorpe Park in the comments so no major name alternations. I think the main branding is going to move away from island theme to a feel good vibe, also straying away from extreme thrills marketing.
In terms of the logo, I think anything is possible really. I feel like they may use lots of vibrant pastel colours to represent the relaxed, feel good vibe and maybe implement a piece of coaster track into the logo.
In all honesty I have no idea what they could do, I was personally a fan of the island theme as it made the park unique and felt like it didn’t need changing. As they say if it ain’t broke don’t fix it. But regardless it is good to see that thorpe park are taking care in the future of their brand and identity.