AtLA was great, Korra was better, the movie was garbage, and every new thing I hear about the Netflix show makes me less and less interested, so I'd call this very good news!
There's dozens of avatars and over 10,000 years of history to play with, so it's nice to finally see something new done with this criminally underserved IP.
I don't know if anyone here is aware, but there's a pair of novels that came out over the last few years that tell the story of Kyoshi and they're legitimately good books. Well written and in the tradition of the shows; age appropriate for the main character (turns out, Kyoshi was a teen when she was "discovered".) An animated adaptation of that material would be wonderful, but I'm interested to see whatever they choose to go with.
Personally, the story I've been the most curious about ever since the two parter about Wan is the story of the second avatar. Aside from Wan, all the other Avatars we know about were born into a world that already knew what the avatar cycle was all about. There was some kind of infrastructure and support system ready to find them, and teach them who they are and what is expected of them. But the second incarnation of the Avatar? Blank slate! They would have had to discover all of this all by themselves in a world that was still wild, chaotic and untamed, where humans were only a generation or two off the Lion Turtle cities and the four nations are not even close to being a thing.