We now have the product descriptions for North and South Part 2 and Part 3. Spoilers ahead if you consider these official solicitation descriptions spoilery for the as of yet unreleased North and South Part 1.
First up let's go back and look at the Part 1 description.
When Aang leaves to aid Zuko with the Kemurikage, Katara and Sokka return to the Southern Water Tribe by themselves. Katara is shocked to find that her beloved village has become a bustling city, with none other than their father, Hakoda, in charge! A northerner named Malina seems to be behind this change, pushing the North and South to be more unified . . . but what are her true goals?
Here is Part 2
After attempting to kidnap Katara and Sokka, Southerner Gilak leaves a haunting note for Hakoda: “Soon you will see the truth, chieftain”. The vow leaves everyone on edge—including Katara, who remains wary of the two tribes’ integration. As Northerner Malina announces a partnership with the company owned by Toph Beifong’s father, her own brother comes forward to defame her. Have Katara’s worst fears been confirmed?
And finally Part 3
Fire Lord Zuko and Earth King Kuei arrive in the Southern Water Tribe amid protests of Gilak’s imprisonment. While the leaders hold council to solidify Malina and Hakoda’s unification plans, Gilak breaks free and leads a powerful rebellion! In the face of these two opposing tribes, Katara will have to make peace with her nostalgia and distrust to save the home she loves from being permanently torn apart.
The most notable thing here is the mention of a new character from the South, Gilak, who seems to be presented as a villain type character in a similar way to the way Malina is presented in the Part 1 description. I have a feeling that it won't be as black and white once the books actually come out since this North vs South issue is a very complex topic that even gets Zuko and Kuei involved at the end.
We also learn why Toph is involved in this book as it has confused many fans, she is clearly coming to the south as a representative for her father's company the Earthen Fire Refinery. Which in The Rift was in essence a mining operation which begs the questions of what interest does Lao have in the south, what is there that his company may want or is this just a way to make a deal about workers for the refinery like Katara's friends from the South we saw in The Rift.
I have more in-depth thoughts on these previews in this youtube video.
North and South Part 1 is out September 14th in comic stores.