Here's a excerpt of the official Activision announcement:
This is a TEST and players may find compatibility and performance issues that will be addressed before the final release. The purpose of this test is to report these issues so that we can address them prior to the release of the game. Players should also understand that the system requirements listed below are very close to what we expect in the release version.
Of course ET.com will also offer a download. Certainly still today. I still brood over how to manage the high traffic.
Until then try downloading it at Fileplanet.com. Most other sources couldn't manage the high traffic and are down.