From a few things I gleamed off articles. The G4 has a wider iris or something, appature or something like that. Because of that, even though it has a lower pixel count, it takes more vibrant pictures and better pictures in low light. Some of the settings on the G4 picture wise was pretty cool. Like you could take up to a 30 second picture. I don't know what the technical term was, but it's that night thingy you take to make the picture really pop.
For anyone that has had a G3, since the G4 isn't out yet? Does the G3 have a panaramic type of shot, where you can take a continuous picture, like a landscape? And do they have that all around you type of picture where it will take a 360 and even above you dome like shot?
While I have some reservations about the G4. They actually may be the last man standing when it comes to removable batteries.