I don't know if this is a repost but below is a link to the Austin Business Journal's comprehensive reporting on all developments surrounding the building of the F1 facility. A track rat buddy of mine with an office is Austin has been feeding me info and this link was recently created to facilitate obtaining information as available. I don't know of a single source other than the Tavo Hellmund that could provide more timely insight.

Continuous Coverage: F1 Austin - Austin Business Journal

It's like being a fly on the wall. I hope they succeed. On a recent trip to Austin we took a drive to where the facility will be built. Looking at the track layout it will be exceptional when completed.

 

Thanks for the link, will be interesting.