Nowadays it's quite hard to imagine Tour de France without the hight altitude mountain stages. The good news is that you don't have to. As every year since 1910 Tour de France will visit the Pyrenees (also the Alps, which was visited in 1911 for the first time.
Accourding to the latest speculations, the previous rumours about Toulouse would get bigger role at next year's Tour de France seems useless.
It seems rather that Auch will be the start of Stage 11 finishing on Superbagnéres.
Stage 12 will start in Pau and end on Hautacam.
Also, it's quite possible that the 13th stage will be a mountain time trial starting from Loudenville, finishing on Peyragudes.
Earlier this week came the news that Carcassonne will host the finish of stage 14. When a stage finish in Carcassonne it's usually a bunch sprint day, thus it's possible that this will happen in 2025 too.
That could means that most likely stage 11-12-13 will be the Pyrenees stages next year.
THE INTRODUCTION OF TOURMALET TO TOUR DE FRANCE (1910)