Sonic 2: Analyst Expects Sequel Announcement Involving Tails

Sonic the Hedgehog introduced Tails in a post-credits scene, and it
Sonic the Hedgehog introduced Tails in a post-credits scene, and it's expected the character will factor into a sequel.

Sonic 2 Begins Production; See Official Announcement

Sonic News Nintendo Life

Sonic the Hedgehog 2 Title Announcement Video Confirms Tails

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Sonic movie sequel debuts internationally to 25 million dollars in box office numbers - Tails' Channel

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Production signs spotted for Sonic the Hedgehog 2 in a Vancouver suburb - Tails' Channel

Sonic the Hedgehog (2020) (Film) - TV Tropes