As of yesterday, Sigma has shaken up its point-and-shoot line with a major refresh of the powerful-yet-strange DP Series of cameras. Dubbed DP 'Quattro' (the old ones were Merrill) the new line of Foveon compacts from Sigma represents a significant visual redesign and some minor (but important) changes on the inside.
Sigma's DP1, DP2, and DP3 cameras are known for the fact that they're compact cameras with beastly APS-C Foveon sensors inside. With such novel sensor technology at their core, comparatively less is said about the f/2.8 lenses on the front of each camera.
Some folks over in China decided that they wanted the glass of the camera to be just as hardcore as the sensor within, so they figured out how to modify DP cameras to offer an Leica M mount, turning the bodies into interchangeable cameras (and proper mirrorless cameras).