This was being touted in the press at Christmas. Looks now to be real;
https://www.theguardian.com/world/2018/jan/10/france-cuts-speed-limit-rise-deaths
The reason I abjure road cycling outside towns as much as possible is that I'm losing the ability not to imagine being struck from behind by a tonne of metal at 60mph. 50mph would still be fatal but much quieter, much calmer and much safer.
It will be interesting to see the extent to which the 80kph limit is as disregarded as the current 90kph limit.