I came across this video showing the current state of the Spessartrampe reconstruction. Apparently the new route is in service now and they are working on removing most of the traces of the old grade:
I'm sad to see that they decided to remove the old route entirely. I remember watching 194s pushing freight trains up that line, among other things. The new routes just lack the sense of history and character that the old ones had, but I suppose eventually the new ones may acquire their own.