Nice project at the Railyard site, but I wonder how "real" it is. We've already seen marketing material before for that site. Remember this? Click link:
As for the height for that new one, I'm not sure it's quite 1,200 feet. The shorter tower seems to be around 650 feet as compared to the Austonian. The lower portion of the taller tower appears to be the same height as the shorter tower. The upper portion of the tower has 28 floors, so it might add 350 more feet. The number of floors seems to be at least 75 in the taller tower. I think the height is probably closer to 1,000 feet, which would still be mindblowing if they were able to pull it off.