There have been rumours of two family attractions in Rookburgh. I think there will definitely be at least one more attraction.
Something which a number of people on PhantaFriends.de have been hoping for, as a modern replacement for Race for Atlantis, is an Intamin Ultra Tower.
https://www.intaminworldwide.com/project/ultra-tower-2/
I can see why Phantasialand might be attracted to this system. It'd be a more exciting modern simulator for families and with 4d special effects and music it could be quite immersive.
It's a high capacity attraction (1,440 pph) on a small footprint and an unique/world's first attraction. Also it was apparently said when Maus au Chocolat opened that the park were fond of the system as it gave them the possibility to refresh/update the attraction easily by changing the graphics/films. Same would apply for a simulator of some kind.
However my only issue is be it Ultra Tower or Flying Theatre what would be the film be? Flying over world landmarks has been done to death. Perhaps the park have invested in a high quality specially made film of flying through Rookburgh/steampunk landscapes/buildings.
Again I'd like to clarify (I don't wish to start rumours) there is no evidence this will happen. It's merely speculation/wished for by some fans. *
For all we know they could simply be adding something like a rocking tug...
* Although funnily enough this was first suggested by a forum user in August 2016. A few posts later someone else suggested the prototype flyer Vekoma had started working on - only to be met with ridicule as there was no way PHL would be building another coaster so soon.....
Also it seems Chris' aerial photograph is from July. Back on 15th July it was reported on PhantaFriends.de that 2 helicopters were flying over the park a flew times and apparently hovered over the construction site quite a bit.
Odd he'd post it now. Are we expecting a video or is he just teasing us?