Someone on Reddit discovered an article with a future Philadelphia International Anthology mentioned:
Kenny Gamble and Leon Huff announced Monday that 2021 will be marked by re-issues, radio shows, and a celebration of the Sound of Philly.
www.inquirer.com
TL/DR
"Beyond that,
the music club Vinyl Me, Please will release this summer an 8 record-set called
Anthology: The Story of Philadelphia International. Both the Snapper boxes and the Vinyl Me LPs are being released in conjunction with Legacy Recordings, the catalog division of Sony Music."