JVC has announced two new ProHD handheld cameras designed for broadcasters and the release of the first handheld 4K camcorder at the NAB show today. The GY-HM600 and GY-HM650 are what JVC calls ìnext-generation handheld ProHDî cameras suitable for mobile broadcasting, and the previously announced GY-HMQ10 is a camera which allows for realtime capture, record, and display of 4K video.