But for those who want a key and prefer not to leave it up to chance, there's a forum thread asking players to name the critter they see in the header above. The five best entries will receive a beta key, followed by a vote-off of all the suggested names. So there's a chance at getting in just based on your creativity at naming things, which might be more your style. The name contest will run until December 22nd, while the Facebook entries are accepted until January 15th.
[Thanks to Gabriel for the tip!]