You’ve probably seen this article, it is a bit dated but covers some of the problems with expanding the ski area:
I heard they were busy doing some terracing work this summer in the Basse Combe area which is related to the extension of the ski area. Some freeriders are not happy with this. There are still very strong objects from environmental groups including FRAPNA and Mountain Wilderness.
The latest news are 2 new chairs: The Chamois at les Saisies (2000 p/h) and at Notre-Dame-de-Bellecombe,
in the Mont Rond sector (2400 p/h). 2 new drag lifts: les Trolliers at les Saisies and the 3 Coins which links Praz sur Arly with Notre-Dame-de-Bellecombe by the summit of the pistes. Three new blue runs in les Saisies, Praz sur Arly and at Notre-Dame-de-Bellecombe. A telecord at Notre-Dame-de-Bellecombe to ease skier access.
This is the new plan for the liason les Contamines / Megeve