The new G branding brings it in line with keyboards, headsets and laser mice that Logitech already has available, but the look and style seems to be classic MX territory. And thats no bad thing. Key specs are a variable sensitivity up to 3600DPI and a 1000Hz polling rate, and a driver that works as part of the same suite as other G products.
http://www.pcgamer.com/2011/06/09/lo...es-g400-mouse/