G6 still suits me fine, but if I need a new one...
I've had my G6 for about 3 years and absolutely LOVE it. If I ever need to replace it, I will no doubt select the new G11. The G7, G9, and G10 didn't have the tilt/swivel LCD that my G6 and the new G11 has. I've you've ever used one, you understand the broadened capability that brings. Using the tilt feature, I was able to shoot over the heads of the crowd to get parade shots, etc, that I would have otherwise missed. For a shorter person, that is worth its weight in gold. Using the swivel, I am able to protect the LCD from incidental damage or scratches. Mine is as pristine as the day I unboxed the camera because of this feature.
I am by no means a pro, but my experience with the Canon G-series has always exceeded my expectations by a wide margin - including battery life. My G6 uses a Canon camcorder battery. A bit bulkier/heavier, but I've shot over 600 pictures at an airshow (including some flash interior shots) and never dropped the battery level below 50%. My camera sits in my carry bag for WEEKS at a time between charges. If the new G11 has similar battery life, then that's another reason for me to buy one.
One feature my G6 has that subsequent G-series units lack is the backlit status LCD on the TOP which displays resolution, flash state, #shots remaining, etc. This is incredibly useful when shooting at night. It's lit dimly - bright enough to read, but not so bright as to ruin one's night vision like the LCD. I wish Canon would bring this feature back to the G-series.
Overall, I've been more than impressed with this line of cameras and wouldn't hesitate to purchase a G11.