We understand your confusion, but it's best not to question it. Fileplanet is giving out Huxley: The Dystopia closed beta keys to all account holders now, not just their subscribers. A couple quick button presses is now all it takes to find yourself braving the lunar apocalypse with all of your friends!
A small note of instruction: if you get your beta key from Fileplanet, you will have to still make an ijji.com account for the closed beta test. You can do that right over at the Huxley closed beta page without much fuss at all. Now go forth and kick those Sapiens all the way back to the early days of evolution.
Update: As so many commenters have pointed out, this offer is only available for the US and Canada. European gamers, it appears, are locked out of this promotion being offered by Fileplanet.