The Blackmagic Design 4K Production Camera was announced at the same time as the Pocket Cinema Camera, back in April. Originally the camera's were slated to be released somewhere around september. Both were late. The Pocket is only recently getting up to delivery speed, and the 4K is still only on the horizon. But it's getting bigger, today Grant Petty has made the first 4K sample footage available to download now. Be warned: in true 4K style, it's a download of around 10GB!
I'm personally hope to get this footage through the grinder around Christmas when my new editing rig will be assembled!