You know, there's a park in California that could really use a new coaster like this, since the last new one was over seven years ago...
The last brand new major thing at Legoland CA was built nearly four years ago now..
I'm still sticking with my Zerier theory. It seems as if Zerier is to the Lego Parks as Intamin is to Hershey.
As for the theming, based on the concept art, I imagine it will start out above ground, do a good majority of te layout, the. Have the drop and darkride section as the finale ala Th13teen. Also, I suspect Polar Bears will play a major role in the ride seeing as they are strongly emphasized in the concept animation.
Just thinking out loud here...
Edit: Also, don't forget that technically speaking, while they are their own separate companies, Blackstone does own both Merlin and Busch Entertainment, and I wouldn't be surprised if some kind of multi-attraction deal contract has been established as possibly a slightly cheaper way to add additions to both companies' parks.
TPR's Biggest Legoland Nerd, and proud!