The LGV line was a nice start to maybe expand into some until now unexplored countries. A "normal" train line in Belgium or France would be a nice change from all the lines in Germany, UK and USA. I know of some nice scenic lines in the Ardennes where you ride next to the river in a valley for example. Let's hope they choose one of these countries for a change
I'd really like a classic French route, possibily with Corail coaches. The Netherlands remain at the top of my list though. The general conclusion however should be that continental Europe has way more to offer than just German routes, and that players would like to see them.
