Mark your calendars! December 15th is the official early access launch date for Star Wars: The Old Republic. Although not yet announced, BioWare updated their FAQ about early access and added a line which was spotted by a SWTOR forum member.
Early Game Access may be up to 5 days. The length of your Early Game Access depends on the date and order in which you redeemed your Pre-Order Code at the Code Redemption Center
I thought it was going to be earlier than that, but I guess 5 days is good enough.