Can I also just put out there that most of the time park's social media teams have no clue what is going on behind the scenes at the park, or even within the park itself (in terms of ride availability etc).
At the beginning of Phantasialand wintertraum talocan was closed for about a week due to having its control box changed yet the social media team decided to post on instagram advertising riding talocan during the winter season... they later then took this down after a number of people (including me) commented that talocan wasn't actually open and therefore was misleading to advertise it on instagram.
The reply from Thorpe's social media team means nothing. There's no point poking around at what big development is going to be new because when a big new development comes through(if ever), then planning permission will be submitted, otherwise there's absolutely no point getting your hopes up. Their 5 year plan is probably to try and survive on the low budgets that merlin have given them by bringing in new temporary attractions to try and save as much of their falling visitor rates at possible.
It's such a shame as I used to enjoy Thorpe a few years back but now I'm honestly waiting until Merlin sell the place off and hopefully someone who actually cares about the place can do something to bring it back up to a reasonable standard again. Merlin's focus clearly no longer lies with Thorpe anymore because they don't have the secured market that chessington, Alton Towers and Legoland do. Unfortunately they have built themselves up a reputation of being a place for "local teenagers" to hangout and that's unfortunately not a market that can be relied upon for a sustainable future of the park.