As you can see on Figure 1, HydroJet will be a cylindrical CPU cooler with a radial fan.
click to enlarge Figure 1: OCZ HydroJet CPU cooler prototype.
It will have aluminum fins with several aluminum heat-pipes, as you can see on Figure 2.
click to enlarge Figure 2: Aluminum fins and heat-pipes.
What is unique about this cooler is that it has an attached pump with a closed water cooling system (the black portion between the copper base and the cooler body on Figure 3). The base is made of copper with carbon nano-tubes in the middle (the black portion found on the base).
click to enlarge Figure 3: OCZ HydroJet CPU cooler prototype. Below the body you have the pump and below the pump you have a copper base with carbon nano-tubes.