All we know is that there will be grandstand seating that isn't PSL, but they will be separate from the PSL ones. The PSL stands are on the main straight, turn one, and two at the arena section.
So from the model, it looks like there will be grandstands for non-PSL holders at three locations along the esses, two at the hairpin, one at the arena, and one between turns 19 and 20. That's a guess, of course - three of those stands look different on the model, so they may be some other type of seating.
Prices are supposed to be comparable to Canada. Tickets are supposed to go on sale in a few weeks, but those who have put down a deposit but who declined a PSL are apparently getting first shot.
And BA is supposed to announce a direct flight to Austin if they haven't already. At least that was the talk a few months ago.