BioWare has added a new entry into their online Galactic Codex. The batarians are a new race in the first downloadable expansion, Bring Down the Sky.
"A race of four-eyed bipeds, the batarians are a disreputable species that chose to isolate itself from the rest of the galaxy. The Terminus Systems are infested with batarian pirate gangs and slaving rings, fueling the stereotype of the batarian thug. It should be noted that these criminals do not represent average citizens, who are forbidden to leave batarian space by their omnipresent and paranoid government."
Read the rest of the entry on the batarians at BioWare.