It took some time, but Cisco started to migrate from the blue RJ-45 based console cable to an USB based console cable. The latest types of routers and switches are equipped with both types of connections or only with the USB based connection, like the new IBM blade switches.
The picture below shows the console ports on a Cisco 2921 router.
Sorry for the bad quality, I guess I will never be a good paparazzi. You can see the USB and the RJ-45 connection. To use the USB connection you need to install the Cisco Virtual Com software. The software can be downloaded through the Cisco Download center, like shown below.