The next three new episodes (minus "Before the Dawn", since that was leaked already) are "Cornered", "True Colors", and "Fix".
"Cornered" is about The Team is trapped inside the Hall of Justice for a cage match against a brutal alien gladiator!
Now online it's written that this episode was suppose to air January 5th, but since the hiatus, "Before the Dawn" will be taking it's place. It has not been confirmed what the air date is.
"True Colors" is about When the Reach forms a devil's alliance with LexCorp, Robin leads a squad undercover to investigate.
"Fix" currently has no summary at this moment but it will be airing sometime in January 2013.