Taken from the leaflet:

HexaTrek is a new super long distance hiking route trough all of France from the North-East to the South-West. It crosses the most spectacular forest and mountain areas visiting 14 national parks utilizing 47 known hiking routes in one. The trail has 6 stages of approximately 500 km each and a total of more than 100000 m of elevation. The team behind the trail has crowd funding, a community of hikers, and app for the trail, maps and more. The grand opening will be a through hike in the summer-autumn of 2022 (June to October).