The official announcement of this and the Tour de France route will be later today.
There is a strong rumour that L'etape du tour will be the stage from Mourenx to Pau - 160km through the Pyrenees via cols de Marie Blanque, Aubisque and Soudet.
(Didn't we do this not long ago ?)
If it's true, logistically this could be a dream - the two towns are only 20km apart so it will be as near as you're gonna get to a circuitous route, which is not usually the case in L'etape.