Nintendo Official Magazine had the world exclusive for Sonic Unleashed. They chose one of the earliest released art which has regular Sonic, but the werehog lurking in the background. "It's Sonic, but not as you know him" states the sub head, and that you can get the details inside.
Play Magazine used the same art, but gave it more of a background/wider crop so it becomes a scene. Their cover says basically the same thing. Play magazine tends to use more graphic design and devote more pages / content to the things they cover. It is a somewhat unusual magazine.