I got a call today from an independent company to verify the change of my account - essentially ensuring that I did agree to upgrade my connection and pay more each month. They weren't able to answer any questions though about the connections such as when it would be available.
I have noticed that my connection is actually much faster now than it was just a few months ago. I don't know what kind of changes they have made but today I was able to reach 16 Mbit/s download from Speedtest.net. That's closer to what I should have already been getting with my "30 Mbit/s" connection I pay for now.
The graphic above shows the upgrade schedule for St Nom La Breteche on Numericable's website. Cities with 100 Mbit/s are marked with the year of the upgrade. Those in the process of being upgraded are marked with one of the codes on the bottom right showing which quarter or semester the upgrade should happen. Interestingly St Nom isn't even given a timeline for a fiber upgrade.
A large part of our village doesn't even have cable coverage so I wonder if the headend for our residence is located elsewhere.
I'll update as I find more information. However, with a limit of 5 Mbit/s upstream I'll still go ahead with the investment.