I mostly wonder what they will do in the Alps. They'll probably enter the Alps already on stage 4. Will they then do a high mountain stage? Or just the easiest way crossing into France. And will they immidiately leave the Alps or do more mountain stages? And will they return doing a big Mercantour stage before the finish in Nice. This is a highly unusual route, so it will be very interesting to see what happens.
I think it's more interresting to see what they will do with the middle part of the tour. How are they going to avoid to have to many unimportant stages consecutive? I mean, at the start they have option enough to make interesting stages (they can enter the alps in stage 4 already), and most likely they will have Pyrenees and southern Alps in the end. But what in between?
-3 stages Italie
-1x Alps light (something like in 2020 with the Orcieres-Merlette stage)??
-??
-end of 2nd week pyrenees (I guess the tradition is to big to completely skipp pyrenees)??
-can they resist the temptation to put Mont Ventoux in the route in the last week??
-finally a decent southern alps stage
-time time trial Monaco-Nice
If they want to go to the north and/ or west of France, somewhere in the route should be quite a big transfer.