Takashi Iizuka, in an interview with Brian Shea from Game Informer, has once again stated that Shadow will not only not be in Sonic Superstars, but will also not make an appearance in any future Classic-styled Sonic game.
Shadow is from the Modern series of characters and gameplay that we have introduced. The Classic series exists before the Modern series, so they haven’t met at that time. There’s no relationship, so we won’t be bringing Shadow into the Classic series. Unfortunately, Shadow was in a capsule at that time. *chuckles*Takashi Iizuka
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Source: Game Informer