Forty seats surrounding a central open food kitchen with no reservations, first come first served, open on Sunday at 6:30PM for dinner.
I'll be in Paris on Sunday standing in line to get in. Has anyone been? He opened on May 7th. I am told that for a single (myself) the wait is surprisingly fairly short. For two or more it can be extremely long. My guess is that the arrangement lends itself to occasional empty single seats whereby an individual can benefit from this.
As an addendum, L'astrance which is also open on Sundays has a two month wait for reservations for weekends.