All posturing - Emmanuel "Rothschild" Macron represents the status quo - Pro EU/EU foreign policy, socialist, and "postnationalist" (meaning more of the same immigration policy). With all parties throwing support behind him, in addition to the left leaning mass media swooning over him (a la Trudeau), this is undeniably his race to lose. 

That said, there exists a segment of the voting populace who are closet Le Pen supporters (likely out of fear of persecution from the regressive left). Should that group be bigger than expected (as was with Brexit and Trump) it could be an interesting week. There is also a chance of a well timed "bombshell", outing Macron's sexual orientation and exposing his current relationship with his elder former teacher/current spouse as a front. Sexual orientation matters to some, and a perceived lie on the issue could matter even more to others. I made the prediction here last year that she would win, and although that result seems unlikely, I'll stick to it.