Much more speculative than an update, but there's a chance it may not actually happen this year: https://www.thorpeparkmania.co.uk/index.php/2025/01/26/beach-renovation-delayed/
The park have had to submit more planning evidence to satisfy some consultees, which means it's unlikely that planning application will be able to be approved until late February. Just seems unlikely it'll happen for 2025 and more likely be delayed for 2026.
There's also rumblings of restructuring happening across Merlin, which may well have knock on effects all round.