Once Upon A Time is set to premiere it's third season September 29th on ABC. Executive Producer Adam Horowitz has taken been all over Twitter spoiling episode titles galore. He had previously revealed the first three titles and script teases a couple of weeks ago here.
Episode 4 ~ "Nasty Habits" ~ written by David H. Goodman and Robert Hull
Episode 5 ~ "Good Form" ~ written by Christine Boylan and Daniel T. Thomsen
Episode 6 ~ "Ariel," which features JoAnna Garcia as Ariel.