As expected, Panasonic has officially unveiled the Lumix DMC-GH3 today. While other Micro 4/3 camera lines seem to be staying the same size or getting smaller with each passing generation, Panasonic has taken a step in the opposite direction. Below you can see the GH2 on the left and GH3 on the right: It's not a move which will suit everyone. After all, Micro Four Thirds' raison d'être is its small size. However as Micro 4/3 continues to mature into a more comprehensive system, it's only natural that we see diversified options. The GH3 clearly distinguishes the Panasonic GH line from the G line. This is meant to be the most "pro" of the Panasonic Micro 4/3 offerings to date. When you think about the Panasonic 12-35 and 35-100mm f/2.8 constant f-number zooms, neither of which is super small, this body size makes good sense. Key features of the GH3: - Dust and splash-proof magnesium alloy construction - New 16MP sensor - New Venus Engine - 6 fps shooting (or 4fps with live view) - Five customizable function buttons. - New OLED EVF and rear display - 60p video capture - 80Mbps bit rate maximum for video The GH3 is a large step forward in video capability, which has always been a strength of the GH line. For still photography, Panasonic is promising significant gains in image quality as well as a robust, weather resistant body to go with their f/2.8 zoom lenses. One of the key questions remaining is whether the gains in image quality are a function of improvements to the in-camera JPEG processing only or whether there have been gains in sensor performance as well. Based on specifications the GH3 does not seem to use a multi-aspect ratio sensor like its predecessors, and there are unconfirmed rumors that Panasonic may be using a Sony sensor in their new flagship camera.