The ETA is something that could probably be added, yes.
The route I think would work better on a little SVG map, don't you think? Arrows showing the travel from one region to another...
Could, for nicer-looking maps, but simple arrows would be possible with what is currently available (trade settings map), and just as sweet to have. For now at least.
It would also be nice if banker's could see the how far out each regions caravans can reach.
Hell, if I could tell how far my own caravans could reach. This would definitely work a lot better on .svg maps, but could work with a system similar to game-generated religion reports.
I do plan on making the .svg file for Dwilight... but that continent is hella big, and I'm pretty busy.