The release of LGV Méditerranée is getting ever closer as it's stats have just entered the Steamdb: Release shouldn't be too far away now. Source: https://steamdb.info/app/1282590/history/?changeid=U:19968254
Probably at least 2 weeks away. It has been about 2 weeks since the C40-8W stats appeared, and that is coming out this week (and on a roadmap week too), so I would expect the same for this route.