This morning Marvel released thirty-two Avengers: Endgame character posters. The surviving heroes had full-color posters, while the dead or dusted characters had black and white posters. As Gamora is dead in Avengers: Endgame, her poster was in black and white, but fans have noticed something interesting while studying it.
Gamora is wearing her sleeveless costume from the first Guardians of the Galaxy on the poster:
She had a different costume that was used in both Guardians of the Galaxy, Vol. 2 and Avengers: Infinity War where she had a long-sleeved jacket. That was the costume she was wearing when Thanos tossed her from the cliff on Vormir.
Last year a rumor came out that via time travel (likely Quantum Realm Time Vortexes), the movie would revisit the events of the first Guardians of the Galaxy involving the Power Stone. In an Instagram video filmed during the production of Avengers: Infinity War and Ant-Man and The Wasp, Zoe Saldana was seen on set wearing the Guardians of the Galaxy 1 costume:
With this poster coming out today showing her again wearing the original costume, and the evidence from the production that it was used on-set, chances are looking very good that we may be revisiting the first Guardians movie at some point in Avengers: Endgame.