Vern, I started on the T:ANE route file formats a couple of weeks ago. Then I had to interrupt that work for some urgent stuff in the Zusi area. And now I am enjoying holidays for a few more days.
However, my T:ANE analysis work did already yield a few results. The track file format had to be revised, of course, for superelevation and track roughness. The ground file, on the other hand, appears to remain unchanged. There are a few fields, probably introduced with TS12 (can't tell from here) that now carry information, like the more detailed diurnal settings. I guess, the blue haze is originating here but I did not get that far yet.
But ground vertices and ground textures seem to be organized exactly as before. And, in essence, that are the only things which matter that TransDEM produces.
I'll report more analysis results once I have them.