well, no one seems to have an actual review for the fusion, but it looks pretty cool to me.
the only mention of the sensor I've seen is this from a press release:
The Logitech QuickCam Fusion webcam uses Logitech RightLight technology, which is a system of hardware and firmware technologies that improves the image quality of a webcam in a wide variety of lighting conditions, particularly in low light. Logitech RightLight technology consists of advanced sensor technology, sophisticated firmware and high-quality lenses that work together to deliver greater light sensitivity and optimized skin tones, while minimizing distortion of the images.
It sounds to me like it's an improved version of the CCD sensor (or at least it better be for a hundred bucks....)