Personally, I believe that world war 3 will utilise computers much more. global intelligence will become a top priority, with agencies like the NSA, and GCHQ not only stepping up and becoming more vocal, but possibly even recruiting whoever they can. It will be a race to try and disable communication of the other side, prevent news getting to those waiting to start a MAD scenario. It will be much more about disabling the technology of the other side, rather than killing the footsoldiers. We are fast approaching the point where computers are a much more powerful weapon than the equipment we have on the ground.