Early Mercantour mountain stage is great!
Pas de Peyrol stage finish is good
Mont Aigoual with Lusette would be great. Without Lusette is pretty mediocre.
Loudenvielle via Mente, Bales and Peyresourde is good.
Based on the rumours so far, the overall impression of the route could vary from mediocre to best route design in many years, depending on what they do in the Alps, and if they add Lusette to the Aigoual stage or not. With Lusette and a couple of really good Alps stages, this would be one of the best routes in the soon to be 20 years I've followed the Tour. Without Lusette, with the same Tignes stage as this year and with an another uninspirational Alps stage, it would be a pretty mediocre route.