As Gavin said, why they're teasing the likes of a Waveswinger (and Dodgems last year) is beyond me. Yet in 2014 they announced Marble Madness in December and kept posting construction updates.
I would have thought it would be to do with the change of management as appose to the parent company. 2012-14, with Alex is Camelin in charge they added like 7 kids rides, 2 new shows, drop tower, Hobs Pit and a coaster. With a strong social media presence, and the very, very good Chills Halloween event.
Yet with this new guy in charge, they've added a Dodgems, and now a Waveswinger (both of which they already have), with little to no social media presence. The Halloween event has also gone down the pan, and the Castle Theatre now zits unused...