Richard Garriott (the creator of Tabula Rasa and other big games) is going into space soon, and as part of a promo, you can try out the game for free for 7 days and also enter to have your DNA sent into space along with him. It'll be stored on the international space station, incase the human race is demolished and needs to be "rebooted" by aliens in the future.
The game trial doesn't require a CC, so I guess they're hoping that you'll get far and not want to lose your progress.

