User blog comment:Rainbowroad6w/An unreleased skateboarding Sonic game intended to be for XBox?/@comment-1535286-20110430032229/@comment-1535286-20110430032847

One of the main reaons is: the voice acting. All voices (even fo Shadow) are clearly just clips of Ryan Drummond from SA2. If SEGA was working on this, there'd be new clips.