So I guess post production for the first episode is done soon. Seems a bit late, considering they filmed the episode 2 months ago
ADR?
Automated Dialogue Replacement
It's how they rerecord lines of a scene in case of problems with the original. It's very common to pick up other set sounds or just have a bad recording where part of the dialogue isn't clear enough and that's when they use ADR.
Basically they have a looped recording of the line playing over and over which the actor listens to and says the lines in time to what they are hearing. Once they have it matching perfectly the new recording replaces the old recording
It's become a bit of a generic term these days to refer to any form of post-production dialogue recording, including Lucas' voice-overs.