NCsoft released the answers to some frequent (albeit randomly) asked questions about the end of beta, when the servers launch, and pre-order bonuses.

When will Richard Garriott's Tabula Rasa™ be released?
Answer

The release date for the Richard Garriott's Tabula Rasa™ Pre-Order was August 10, 2007.

The current release date for Richard Garriott's Tabula Rasa is November 2, 2007, setting the head-start to begin October 30, 2007.

All these answers will link you right to RGTR or NCsoft's support site so go check it out.