I get your point about buying a G12 on sale especially if the improvement is only incremental but I wonder what is meant by the latest comment.
More PowerShot announcements are expected, a G12 replacement I’m told is likely, as well as a new fast lens PowerShot.
What is meant by 'Im told is likely' a guess, an unsubstantiated rumour not even a CR0?
I had not noticed the difference in the ISO differences between the G11 and the new P7700 and anyway I wonder how you can say that you used the G11 at such a high ISO as when I used it at high ISO for a night shot I found the resulting image almost unusable because of the high noise level even using noise ninja I was unable to produce a satisfactory image at that level.
Actually, it is my wifes camera, and she used it at ISO 3200 at a theatre rehearsal in very low light. She doesn't know anything about ISO settings, someone set it to 3200 for her. Truthfully, I was suprised that she got anything at all. Then, I also tried it at 3200 the next night, and it was far better than I expected, even though far from wonderful. It works fine as a small print. The drawback to theatre use is the slow shutter speed, so you do get motion blur.
My point is that, if the P7700 has a far better sensor, why is it limited to 1600? Small CMOS sensors may not perform as well as CCD, even though they are backlit and use less power.
At any rate, here is one of the ones she took.
G11, ISO 3200, f/4.5
Here is one I took at the next night's rehearsal also at ISO 3200, but with my 5D MK II and 35mmL at f/1.6 and a much faster shutter speed.