Check out Eggman and Splash Hill Zone for Sonic 4
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SEGA has updated the Sonic 4 site website to include new media and a free MP3 download.
Oh yeah, and it shows Eggman flying around and the Splash Hill zone.
It's looks pretty swank, and should get you pretty pumped for the first episode.
Check it all out through here.
The game's slated for summer on PSN, WiiWare, and XBL.