Somewhere at Sonic Team is a whole "roadmap of Sonic titles," says head honcho Takashi Iizuka, and the devs "think about which game to release in which year"

Sonic Team head Takashi Iizuka has explained how the studio plans out the releases of Sonic games on a roadmap internally.
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139 movie sequels currently on the way

Hollywood still loves its follow-ups – here’s our round-up of 139 (and counting) sequels currently on the way. ...