DCRP Review: Canon PowerShot Pro1
Reading between the lines, this is a downer. The Pro1 CCD is just too small with current technology to capture 8 megapixels properly. Canon's last great camera in this lineup may have been the G3 (I have a G2 which I'm very fond of).
I'd been hoping they'd use their Digital Rebel CMOS in the f/u to the G5, but maybe it didn't fit the form factor.