Further, spots in the class always arise in July/August, as evident on TLS/LSN. So I wouldn't assume "finalize the class" is always that "final".
They didn't last year.
Also, they've already done the WL so much differently than they have in past years. i.e. waiting until June to start WL movement.
ETA: Correction. One person reported getting of the WL last year on 7/22 on LSN. But the traditional August wave never happened.