I got ahead of myself assuming this nomination was for 2019. Every article seemed to say "finalizing", which I wrongly assumed meant by this February! However, what we can determine is that a transnational Mont Blanc nomination will come before the WHC fairly soon. My guess is Switzerland will add a tentative nomination in the near future.

especially as France could lose one natural WHS with the independence referendum (next year) in New Caledonia (lagoons)