Sonic The Hedgehog 3 came out over 15 years ago. There have been many additional Sonic games after Sonic 3 but none have been classified as a true sequel until now. Sonic 4 Episode 1 is due to come out this summer. By Episode 1 I take it Sega will be releasing multiple episodes of Sonic 4 to follow this. Although it’s not confirmed by Sega, the game may also be hitting the iPhone in addition to PSN, XBOX Live and WiiWare. The official website has hints all over it that there is an unannounced platform that the game will be released on. And with iPhone games selling so well lately, Sega would be crazy to pass up that market.
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