I was driving through the area near the Samsung construction zone, and I saw a tent with a group of people at FM 3343. It turned out it was the official groundbreaking ceremony for the construction of the FM 3343 overpass. I missed the main event, but there was still some activity and I took these photos.
When leaving the event I saw a car-carrier with a load of Teslas going to a parking lot on the southeast corner of the intersection. That parking lot is the site where Teslas are loaded onto trains.
I just looked at the long term schematic for this intersection, looks pretty clear that they intend for US79 to be a full freeway between Hutto and Taylor:
https://www.wilco.org/Portals/0/Departments/Infrastructure/Roadbond/Documents/FM3349/20200910-FM3349-Final_Ultimate.pdf?ver=2020-09-14-152659-823