The new central core is a giant dirt pile.
This attraction won't even have an entrance facing the core.
We'll see what there is to the core once they finish building it but from the concept art, it looks like it's going to be the fourth, as of yet unannounced "neighborhood" for the front of the park, "World Landscaping & Retail".
The only reason I can guess or reasonably justify for this area being left a mess for so long now is they needed access to finish this walk-through.
Hopefully they finish the area on the other side at a faster rate than they did the area in front of Spaceship Earth now that major construction on this project seems to be complete.
... then we can properly judge, applaud, and/or mock what they've done after the half-decade of construction that's torn up this half of the park is complete.