Didn't see the zero gravity track in the rendering, not sure what that is.
Here is what i was talking about,
The neon green and yellow structure in the left side of the image is a zero-gravity track, If you've been to Main Event (quick example I could think of) they have this similar thing except it is indoors. Basically you are put in a harness and suspended to the top of the track by a rope, then you can walk freely around the designated track, and if you slip or fall while completing an obstacle, the rope will be there to catch you. This one looks much cooler though because you can traverse throughout the trees and down the retail strip! Quite an experience.
They say that they are bringing in mostly all retailers that aren't already in DFW. So it's going to have unique retailers and not the traditional retailers like you see everywhere else.
I also love that they are doing this because the super cool amenities and exclusive shops are going to secure Grandscape as a VERY unique destination spot for people of all ages. Neither Stonebriar, The Shops of Legacy or Legacy West is doing anything like this. If anything Grandscape will have the upper hand. Brilliant
As for Stonebriar becoming obsolete... It's impossible because the retailers at Stonebriar arent the same ones you will find at Grandscape, its a completely new and different shopping experience that shouldn't take away from the existing shopping centers in the area.