From the pictures I have seen, I can pretty much confirm that there will be an indoor/enclosed section. It looks to me like they are creating a "cut & cover" underground area underneath the cobra - roll area of the coaster.
Take a look at this image:
The girders are the same as the ones used to make the crypt sections of th13teen. It is going to be a building, as the poles are at 90 degree angles to each other.
Think of basements with windows looking up a trench in the ground, (a bit like splash landings hotel actualy). That seems to be what is going on.
After watching a lot of these "footballer's Villas" being build in Alderley Edge, the construction method looks to be the same.
I'm willing to bet that that it will be enclosed with concrete/steel with a roof, then filled over. This would give the coaster enough room for an indoor section similar to "SAW". This to me makes total sense, & ties in with the marketing.
Some examples of the building techniques being used: