For some reason, I couldn't book seat assignments for an upcoming CDG-SFO flight online, so I called the AF. The agent on the phone kept referring to the first rows in Economy cabin (rows 28-31) as "Extra Legroom seats". I even asked if these seats indeed have an extra legroom and he confirmed.

Is that really so? SeatGuru (or the website) does not have that information, and the charge for booking them was significantly lower than, for instance, for exit row seats.