From Harvard Magazine's report on a proposal to rearrange the scheduling of undergraduate classes:
A question from the floor during the generally friendly discussion of the proposal at the March 7 faculty meeting clarified one important point: that with the disappearance of the flex day and adoption of five equivalent teaching days per week, the plan to recapture Fridays as a period for faculty-led instruction is essentially abandoned. There may well be discussion sections for classes that meet three times weekly, but those will be led by teaching assistants; faculty members themselves will largely be free to retain Fridays for research, service, or outside commitments, rather than stationing themselves in the classroom.