Just logged into my FB account, and it appears Flying Blue has a new logo.

It's two squares, one dark blue as in the blue in the Air France livery, and one square light blue, as in the KLM livery. To the right is the words "Flying Blue" in a different font. The "Flying" is in the same dark blue, and the "Blue" is in the light blue.

I can see the logo if I log in, and then go to the mileage summary page. It's in the top left hand corner.