I feel the major need to mention to anybody craving a beta key that Firefall is still very much in development.. they add features and things with almost every patch, and there's still a great deal of stuff missing. For example, outside of perhaps 4-5 quests, a whole lot of exploring terrain, and resource/random gear gathering, PvE content is virtually nonexistant at the moment. Every frame also has to-be-determined abilities or rewards at various levels as well.
So just a pre-warning.. it's not a 'basically complete game demo' like most betas are these days. :P