I-69 and the TTC are not the same thing.
I-69 has been around as a future project for more than a decade now; it's usually proposed route would follow US59. It is now being called "I-69/TTC", but it's scope hasn't changed from a multi-lane highway.
The TTC is the "brainchild" of Gov Rick Perry and a bunch of contractors and developers (and campaign contributors) who stand to make a lot of money off its planning, construction and development. TTC would run through the heart of Texas, generally east of and paralleling I-35. It would have separate highway lanes for auto and truck traffic, high speed rail, and a pipeline corridor.
http://www.corridorwatch.org/ttc/cw-...6map-start.htm
Interstingly, although Perry is the GOP candidate for governor this year, the state GOP platform calls for abandoning the TTC project.