Consumer 4K is on the way, it is now as inevitable as the first 1080p stickers were on your TVs and cameras of 5 years ago. In an interview with DPReview, Nikon’s Tetsuya Yamamoto says that the Nikon J1’s (Aptina produced) sensor is already capable of a 4K horizontal resolution in video mode (although he doesn’t reveal the vertical resolution which I suspect would be lower than 2K).
Nikon have just launched their mirrorless camera. Video samples seem pretty crisp and detailed although bitrate is to be confirmed.
I’ll update the site later after the dust has settled. Until then, here is what we know: