Sony has announced a new 4K camcorder. It has a single 1/2.3" CMOS sensor with approximately 18,900,000 pixels, (though it has an "effective" 8,300,000 pixels.) It also has a 31.5mm - 630mm f/1.6 - f/3.4 lens and built-in ND. It will shoot at up to 3840 x 2160p at 60 fps (150 Mbps).
While the price of $4,499.99 is quoted, currently there's no delivery date at B&H.
With 4K resolution and recording for $4.5K it's pretty impressive. And it has a nice lens and built-in ND. But, it's a fixed lens and a small sensor. For documentary work it would be great, but probably not for most narrative work.