MCU/Disney rereleasing Avengers: Endgame September '26

Officially confirmed that Disney are rereleasing Avengers: Endgame in September 2026 with either a new ending scene or a post credit scene (as the original release did not have a post credit scene) which ties directly into Avengers: Doomsday releasing in December. The end scene of Endgame is the opening scene of Doomsday, making Doomsday a sequel.
 
By all accounts it has been delayed for a week tomorrow, December 17th.

Runtime 1:25 so it is a teaser, I think it will be more a montage of endgame than new footage with the odd shot of Doom.