This project has gone through some changes. It was originally being called "Shoal Creek Walk" and was proposed as a 350 foot office tower with 28 floors.
Whole Foods later expressed interest in expanding their headquarters (their main building is across the street). The project now looks like it'll be 20 floors with a 4 or 5-story retail building nearby.
A Capitol View Corridor runs through the southern portion of the lot, so that is limiting the height of what can go there. The north end has no height restriction.
So this will probably be shorter than the 350 foot height we heard about at first, but it'll probably still be around 300 feet tall.
And with the size change, I'm sure the design is changing also. So I would expect something different than what those images above show.
The map in the link below shows the site. It's number 5 in the map (west side of downtown).
Evolution continues for Austin's skyline
By Shonda Novak
Published: 10:13 p.m. Saturday, Sept. 8, 2012
9. Future Whole Foods headquarters
Developer: Schlosser Development Corp.
Location: West Sixth and Bowie streets
Number of stories: Two buildings, one 20 stories and the other four or five stories
Square footage: 325,000 in the tower; 100,000 in the smaller building
Projected start: late 2013
Projected completion: late 2015 for the tower