On the Lucasarts website, they massively updated chracters. Some thoughts:
Names have still not been revealed for Disciple, Mandalore, or Handmaiden.
All characters are still as yet unrevealed.
Echani Handmaiden may be Atris' Sister, as they mentioned that there are 5 sisters.
Visas Marr is a Dark Jedi and SIth apprentice, so it's likely that she won't be in your party with Handmaiden and vice-versa.
Nar Shaddaa is also official.