Sonic 3 writers say that Amy Rose nearly appeared in the movie rather than just the post-credits, revealing that they have a "great plan" for her future

Warning: the following features spoilers for Sonic the Hedgehog 3... It seems to be tradition now that the character teased ...
Yahoo

Rumor: Sonic 4 to Be a Romantic Comedy With Amy Rose

The possibility of Sonic and Amy Rose being a couple in Sonic the Hedgehog 4 has not been officially confirmed. Speculation has increased after Sonic the Hedgehog 3’s post-credits scene, where Amy ...
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After Sonic The Hedgehog 3's Amy Rose Introduction, I'm Fully Convinced Sonic 4 Will Continue The Franchise's 5-Year Hot Streak

After the smashing success of Sonic the Hedgehog 3, it was only a matter of time before Paramount announced Sonic the Hedgehog 4. An official release date for Sonic 4 has been reported, with the Blue ...
GamesRadar+

Sonic 3 cameos explained: two legendary video game characters appear, but with a twist

Sonic 3 features a lot of characters. We're talking major parts for Sonic, Tails, Knuckles, Tom, Maddie, and Agent Stone; the introduction of Keanu Reeves' Shadow and Krysten Ritter's Director ...