I picked it up the other day, read it. I was impressed with Part 1, and part 2 didn't disappoint.
I felt that how they followed up on Hakoda and Malina being in a relationship was handled in a mature and interesting way. Basically, Sokka is more ok with it than Katara, who has trouble accepting it. But Hakoda and Katara have a very heartfelt discussion where Hakoda tries to relate how Katara feels about Aang. Very well done stuff, I feel.
Toph and Aang show show up for more supporting roles. Aang's involvement seems more minimal -- this is about Katara's development, not his. Toph has a couple great lines that definitely made me chuckle. It's interesting to see that Aang is now definitely taller than Katara, and Toph looks taller and more grown up now too. I'm sure there's been signs of this in past comics too, but it's always nice to get the sense that time is passing and the characters are growing up as the comics progress.
Malina and Maliq make for an interesting duo. There are some revelations about them, and while the revelations are a bit negative, their actions make them a bit more sympathetic and relatable. Well, Malina's do. Maliq's actions...make him seem a bit too dumb to live. But kind of in a good way? As in, it comes from his beliefs and convictions. It's all interesting rather than annoying, is what I'm trying to say.
The action is fun, still fairly low-key. At this point I doubt Part 3 will have anything near as cool as Aang using a giant rock golem to brawl with Old Iron, but there's still both fun and tense moments. There's a moment I won't spoil that had me on the edge of my seat -- I will say it's kind of
a rehash of a moment from ATLA, but it was effective in the context of the comic nonetheless. All the action basicall focuses on Gilak's rebels attacking during a festival, and I'll also say that the way they get into the festival is kind of
silly, but not a huge issue. And Toph again proves herself to be the MVP of the series when it comes to fun action moments.
So yeah, definitely worth picking up and reading. Can't wait for part 3!