Digital Photography Review reports: [edited]
The Lumix DMC-GM1 is a pocketable camera with a 16 megapixel Four Thirds sensor. It uses the same Micro Four Thirds mount that its larger Olympus and Panasonic siblings, and will be sold with a specially designed 12-32mm F3.5-5.6 kit zoom sporting a smaller diameter for the GM1's diminutive form.
Despite its M43 sensor, using the GM1 gives the impression of using a point-and-shoot. The controls are crowded together, and the GM1 lacks a command dial. Its exposure mode dial and focus ring are positive additions for advanced users, but it feels like it could offer just a little more in terms of direct control.
The touch screen takes the place of some of those functions, so testing it in real-world shooting will be key to understanding how the camera handles.