It is still unsure how many digital and hard copies of SWTOR will be available at launch, but Bioware and EA have announced that there will be a limit of how many copies will be sold at launch.
This is to ensure that the servers will not be overloaded and those who perordered the game will have a smooth start instead of a laggy one.
With over 1.5 million already signed up for the beta, Bioware and EA want cause as less strain on the servers as possible. Once they have a better idea of how many people will be playing this MMO, EA will be able to adjust the amount of servers needed.