From todays Yale Daily News at:
Yale Daily News - Defying predictions, yield holds strong at 69 percent
"The admissions office will begin making waitlist offers this week, Brenzel said. In the first round, the office plans to make about 45 offers, with further rounds contingent on how many waitlisted students accept the offer, and on how other schools' wait list offers affect students who have already committed to attending Yale.
All waitlist activity should be complete by mid-June, Brenzel said."