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Normally, forty percent of wilderness permits are available on a first-come, first-served basis at park wilderness centers. Instead, this portion of wilderness permit reservations will be available online. Details will be available soon.
Similar verbiage appears on the Recreation.gov Yosemite National Park Wilderness Permits page:
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Permit reservation requests can be made from 24 weeks to seven days in advance of the start of a trip. The remaining 40% portion of wilderness permit reservations will be available online. More details will be available soon.
Further down on the Recreation.gov site, it mentions what was, I believe, the planned "return to normal" system for FCFS permits this year:
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The remaining 40%, as well as any remaining reservable quota, is available for first-come, first-served walk-up permits at Yosemite Wilderness Permit Stations (assuming regular operations in 2022). Walk-up permits become available at 11:00 a.m. the day prior to entry.
Note the statement in parentheses in the above quote. Sounds like they are changing things up and moving away from a return to "regular operations". Maybe this has been posted for a while and I just hadn't noticed until today, but it definitely seems like a recent shift in their plans for first-come, first-serve permits.