There are a lot of new girl groups. Probably too many. I don’t know how the market can support any but the most successful ones.
TWICE is the biggest deal in the universe right now. Red Velvet and GFriend are also tremendously popular. APink is still quite strong. T-ARA and AOA still exist, but are in weird spots. On the next tier down you have groups like Oh My Girl and Lovelyz. EXID rose up big time, and just regained a member who was ill. CLC also exists, I guess.
Then there was I.O.I., the temporary group formed from Produce 101 Season 1. It’s over now, but most of the members have dispersed into other groups or solo careers. PRISTIN, WJSN, DIA, Weki Meki, and Gugudan all have former IOI members in them. Chungah from IOI went solo, and is awesome. Somi, who took first place, is still kinda floating around in space, but she’s ridiculously young.
Miss A technically still exists? Jia left, and they are on hiatus. The hiatus is likely permanent.
2NE1, 4Minute, Sistar, Wonder Girls, KARA and Rainbow have all disbanded.
If you want to follow what’s going on, I highly suggest just hitting up https://www.reddit.com/r/kpop/. On the right sidebar are links to watch performances from all the weekly music shows. These are very well maintained. They are updated almost as soon as new videos go up on YouTube.
Also, you picked a real bad time to come to KPop because it could all be over really soon. SNSD just had their 10th anniversary. We’ve been looking forward to it for months, and it was amazing, until it wasn’t. Lots of shenanigans with contract renewals, messed up TV broadcasts, shortened promo period, and breaking news all over the place right now. We’ll see how it ends, or hopefully doesn’t end.