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).
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JVC showed a prosumer / semi-pro camcorder at CES (rumoured to be around the $2K mark) with a near-4K image at 60p, and XLR audio jacks.