I played the game ... a very long time ago. I thiiink book 2 was "finished" and they juuuust started book 3. Then, one time I came back, I saw a post about how they've come back to book 2 and added some bits that were always meant to be in there.
Any idea what changed? Is there extra ty lee content at all? I only REALLY care about the Zuko (love?) route, but if there's new stuff, that you know, on the other route, that's fine also.
After some quick glances, it seems that book 4 is by far the longest and with the most content. Don't mind at all. Korra is a BABE! But Azula and Zuko are forever.