At last we have an episode description for Episode 6 "The Sting" as well as "Beginnings" which is a two parter. [caption id="attachment_8159" align="aligncenter" width="600"]Book 2 logo Episode Descriptions[/caption]
K206 -When Triad activity threatens to put Future Industries out of business, Mako performs an investigation and uncovers a conspiracy. K207/K208 - Korra learns about the origins of the first Avatar; Korra realizes what she must do to restore balance to the physical and spirit worlds.  
Source Pretty odd that there is no mention of Korra in the description for The Sting, perhaps she is not even in this episode and Beginnings Part 1 will pick up where she left off in Peacekeepers. I do wonder how this fits into the Book as a whole.