The review of the Canon Powershot G11 is finally up: http://www.dpreview.com/reviews/canong11
It confirms what I suspected: the G11's high ISO quality isn't dramatically better than G10's. The difference is about one stop and it is achieved by more aggressive noise reduction rather than by better sensor quality. If you shoot RAW with both cameras, run the photos through the same noise reduction program and downsize the G10's photos to 10 MP you wouldn't see much difference. However, at low ISOs the G10 has visible resolution advantage. I still think producing a camera with G10-like sensor and articulated screen makes sense. Well, until more micro 4/3 cameras come out and their prices start to drop. Notice how much better the Panasonic GF1 is in terms of image quality! Of course, it HAS TO BE given the 2X price difference, but I'm sure in the next couple of years the m4/3 cameras will kill the G series, unless Canon puts a much larger sensor in it.