I can confirm that the code worked for me 2:30 AM PST
This is done via facebook. Like Nvidia Geforce then approve the app. Fill out the form and you should get a key. As long as they still have some left, you will get your alpha code to type into Origin.
I can confirm this does work and I got a key which Origin accepted. Note this is an alpha test, and not the full game, only multiplayer.
Redeem code here: https://www.origin.com/us/account
Edited by nategator, 31 October 2012 - 09:48 AM.