So yeah, a new maze (serving effectively as a replacement for Platform), and a new experience. Plus maybe some refreshed scare zones.
The new experience is intriguing. There's no real details yet, and you can't book anything specific yet.
But, currently, the price for the "Fearsome Four" add on works out as £37 on top of the entrance ticket. Last year, the Trio ticket for the 3 mazes worked out as £27, and I can't imagine the park will price the mazes as more expensive than £10, or £9per maze when booked as the trio. So that could suggest it's a 'step up' experience compared to the other mazes.
Something similar to Containment wouldn't be a surprise; an interactive scare experience, even if not an escape room.
Personally I'd love something a bit more extreme / designed as a solo experience, but I don't think that quite matches with what the wider audience wants. So wishful thinking there.