Update: The lady at Priceline was helpful and contacted Air France. If I understood her (bad connection) our fare is a consolidation fare and cannot be upgraded. If I remember correctly, we are an "A" fare
I'm not sure what that means as we get closer to the flight, within the 48 hours of flight. I can't imagine we couldn't pay for an upgrade. The price was good at Priceline, but not worth giving up the control.