TATL, AF Tempo equals CO Coach, or Y. As far as I know, there is no premium seating in Tempo. There's a seperate cabin for business, and depending on the plane, first class. That said, you should be able to call in and get any available seat in Tempo.

From France to Italy, there may also be a Temp Challenge section, which as far as I can determine is for full fare economy fares, not status.