The Second Crisis is coming. (Da da dum.)
Foundation returns for Season 2 July 14 on Apple TV+.
On the site page, it explains the next season this way:
More than a century after the Season 1 finale, tension mounts throughout the galaxy. As the Cleons unravel, a vengeful queen plots to destroy Empire from within. Hari, Gaal, and Salvor discover a colony of Mentalics with special abilities that threaten to alter psychohistory itself. Meanwhile, the Foundation and Empire are on a collision course for war with the fate of humanity in the balance.