Something to remember, is everything is always compartmentalized, and hidden many times. There used to be a map that showed all of the corridors across the nation they were planning. Haven't seen that in a few years, but might still be out there. From what I understand, the Canamex encountered so much flack from the people in its way, it has gone by the wayside. Got into an argument about 4 years ago with someone about it. Personally, I feel it has probably been just delayed instead.
With the TTC 35, it looks like they are building it in segments, starting with a highway, which will expand wider from that point. Think that is the SH 131 from Pflugerville to Lockhart, then down to Seguin. Its following the path in the swath that has been designated. Tollroad, but not being built, or collected by Cintas. (Maybe that piece of info hasn't been given out yet. OR, the TTC35 will be in between that toll highway and the I 35. I don't believe it will be between. One of the things TexasMoving states, is usage of existing highways in some places. Once the 131 is finished, it is existing.