Peach/CFA Bowl (and Cotton Bowl) were elevated and are now part of the playoff, which is why they're not in the conference commitments anymore.
I believe there are kick down schemes that push the conference champions into the Cotton and Peach if the bowls with tie-ins are the semifinal sites for that year and a conference champion is not in the chosen 4 teams. For example, the first year of the new scheme, the Rose and Sugar are the semifinal spots. Those two bowls have all of their spots committed to conference champs (Rose=Pac12/Big10, Sugar=SEC/Big12). If any of those 4 champions is not in the 4 playoff teams, then they will go to the Cotton or Peach or Fiesta.