In the new upcoming features video, there was a video shown of a Sith Miraluka on Korriban, this opens up a lot of questions about the legacy system.
In fact, I think you will be able to do something like with what DDO did, where you can start your character all over again, same race, whatever faction and class you choose, and treat them as like, a son, or daughter of your character before. This will also grant new abilities, more skills, etc...