Nikon has announced firmware updates for the D4 (v.1.01), D800 (B v.1.01) and D800E (B v.1.01) SLRs. In the former case, the updates fixes: Camera hangs when a still image was captured while viewing existing images in playback mode, an issue that occurred when sending JPEG images via a network, the camera sent RAW images too and lastly, when an option that utilized the main command dial was selected for Custom Setting f15: Playback zoom, and an image was zoomed in or out with playback with certain settings applied, shooting shutter speed, aperture, and exposure compensation settings were sometimes changed.
In the case of the D800, the updates fixes the camera hang issue as above, and also the network issue when the camera is used with a wireless transmitter. It also fixes the problem of a dark shadow sometimes appearing at the bottom edge of images captured with Active D-Lighting set to any option other than Off with Image area set to 5:4 (30x24). The firmware update for the D800E fixes the same issue. The updates are free for camera owners and full details are on the Nikon Europe support site.