Amateur Photographer has a piece on the launch of the GX-1. Looks interesting. There's also a preview at DPReview. You can also read all about it at the shiny Panasonic product pages. For those who are into the high ISO thing Panasonic claims " In shooting at high ISO setting, S/N (Signal-to-Noise) value is improved by approx. 200% compared with the conventional 12.1-megapixel sensor. The sensor performance improves by 6db at ISO3200 and max. 9db at ISO6400." No idea what that means from a technical point of view but they do seem confident that it is a lot better in low light than the 12MP cameras. AP's article mentions that the sensor is the same one from the G3 so I assume it would offer a similar level of performance.