Disney+'s Loki almost included variants of characters from across the Marvel Cinematic Universe, including a popular Guardian of the Galaxy.
An episode of the Marvel Studios' Assembled: The Making of Loki revealed that Rocket Raccoon had a planned cameo in the first episode of Loki. Assembled serves as an in-depth look at the work that goes into all of the Marvel Disney+ shows, particularly which ideas were kept and which were scrapped. The original idea involved Loki possibly bumping into a Rocket variant while awaiting his trial at the TVA.
Though it's unclear why the cameo was cut, it would have been the first interaction between Loki and Rocket, two characters who have not previously met on the screen. The concept art for the scene shows the Rocket variant (or a variant of Rocket's species) waiting in the TVA's queuing area, along with what looks to be a Skrull and a possible Mantis species in the background as well.
So far, each of the Marvel Disney+ shows has received a Marvel Studios Assembled documentary, starting with WandaVision and moving on to Falcon and The Winter Soldier.
Voiced by Bradley Cooper in the MCU, Rocket Raccoon is set to appear in theaters along with the other Guardians for Thor: Love and Thunder on May 6, 2022, ahead of the release of Guardians of the Galaxy Vol. 3. which is s set to release in theaters May 5, 2023.
Source: The DisInsider