It might be with existing companions or it might not. We might be able to reset conversations or we might not. We might be "safe" if we stopped levelling characters at a certain point or we might have to start all over again. We might have to reach a certain level to unlock a new SGR companion. And so on.
Yeah, more information on this would be REALLY fantastic. I'm now seriously hoping for the chance to reset companion conversations as well as a gender switch. Jedi Knight rambling ahead:
SO YEAH. Conversation reset, and gender switch because playing a knight was a miserable experience for me (despite the good story, Republic makes me cringe and I cannot stand melee), and I never want to go through it all again.