First day to get a reservation is April 21st (first batch is through June 30th).
https://www.nps.gov/yose/planyourvisit/covid19.htm
Also looks like they are not doing online orientation/emailed wilderness permits. You have to pick up in the park like the old days. Dang, I liked that part of last year's changes.
No walk up permits (lotteries 2 weeks before the start date will distribute those).