During the current world tour promoting Avengers: Endgame, Anthony Russo has revealed that himself and brother Joe Russo are developing “a little something” in memory of Stan Lee.
Whilst speaking with PinkVilla, Anthony had this to say:
We love Stan Lee and I think it’s incredibly special that Endgame will be his final cameo. We are fascinated by the life of Stan Lee and we are actually developing a little something that has to do with his work in the history of Marvel. But we are not ready to present it or talk about it yet. It’s more of a documentary.
This is the first mention of this project that Russo Brothers are developing so there is no further information at this time. However it has been speculated that this documentary may be included as a special feature on the eventual home release of Avengers: Endgame.