There's been no announcement or even official suggestion about lifting restrictions on inbound foreign tourists, though Tokyo did just raise its Covid alert level due to an increase in new cases. There's an election next weekend (July 10) so there may be a type of immigration policy shift after that, but that's simply speculation.
But as far as increasing flight numbers, this may just be to accommodate Japanese and other residents who plan to travel abroad during their summer vacation, as well as any students who plan to enter into US universities for the fall semester.