Digital cameras represent a loose link in the digital colour management chain. At the same time, they make colour management simpler by removing several intermediate colour conversion steps - film, development, scanning - along the way. The technology for normalising the input from digital cameras is still to be established, but Photoshop can help bind these devices into a proper managed system for photographers and prepress alike.
Unlike scanners, digital cameras don't capture images with a consistent light source of a specific hue or quality. As a result, you can't produce a meaningful ICC-compatible colour profile for a digital camera: it would only be valid for the precise, identical weather or studio conditions on which the profile was based. The most that can be done at the moment is for the manufacturer to calibrate the camera