Bueno, más o menos eso es lo que pone aquí.
Panasonic has announced firmware v2.2 for the GH4 to make it easier to use anamorphic lenses with the camera. The new anamorphic mode allows the camera to capture video from a 4:3 aspect ratio chunk from the middle of the sensor to match the projection of specialist lenses, allowing genuine anamorphic capture, rather than digital simulation of the look.
Lo he visto en Dpreview y también en Photography Blog y en Que sabes de