There will be some weather I am sure - what I love is that there are such wildly different experiences with folks spread out across 600km of France, some out there for 45 hours and some for 90 hours.
As Phil says, it's looking like it will favour us NW Europeans (and those from NW USA and other damp, windy, not too warm places!).
It only a few weeks on from record breaking temperatures across Europe; that could have made for a real reversal of DNF rates with those from the warmer climes suddenly in their element.
Ah well - unless anything extreme pops up in the long-range forecasts, then there's not much different I will do to any other long ride in summer in NW Europe.