Le Monde: 1er tour de l'élection présidentielle : 70,59 % de participation à 17 h (ministère de l'intérieur)

This means that the ultimate turnout will probably be close to 80%, much higher than expected. Could this upset polling predictions? Possibly. But there's no point speculating. We'll know soon enough. Certainly the #RadioLondres reports that I've been seeing don't suggest an upset, but who knows how reliable how any of the supposed leaks are?