Deadline:

MGM has made an inventive deal with AGBO Films partners Joe & Anthony Russo that will see the Avengers: Endgame helmers essentially become the spiritual creative architects of some of the iconic properties in the MGM library. They’ve made a multi-film non-exclusive creative partnership to co-develop, co-produce and co-finance a slate of projects.

Kinda crazy to see a studio essentially give two creatives the keys of the castle as architects, but hey, totally rad for the Russos, right?