If you would like to download the test ROM for the Samsung site you will need to use the Tool "Check Fus Downloader 2.1" from the site http://fus.nanzen.se/ and use the settings below.
Check Fus Downloader is a tool used to download and decryp the Official Firmware from Samsung's servers. Make sure you push the button to "Enable Test Mode" and then restart the program and click "Check Firmware".
The firmware can be installed with Odin or Heimdall. I will go through the process of installing it after I have done further testing. Hopefully this means that the official OTA update is not far around the corner.