These renderings from Gensler were posted earlier, but I found some bigger ones where you can see a lot more detail.
Gensler has a
Austin-Bergstrom International Airport Expansion page on it's website now. Looks like it was created February 17, 2017.
It's the same 4 renderings, but you can look at a full-screen version of them and see even more detail than the ones I posted above.