I started thinking she might end up a guest, after they let Kira Buckland voice Talim. It also seems like they're doing with Ivy what they did with Geralt: an event in her story has her enter a different world/time. 2B was one of the most heavily requested characters, so of course they would listen to fan demand. I like that they brought out Yoko Taro himself and said it included a new stage, some custom items, and a remixed version of City Ruins. As far as her fitting into the series itself...somewhat hard to say. Automatons are already in the series and you can even make one in SC6. Ironically, 2B looks far more human, than Asholette or the ones in creation. I'm just glad we're getting something new.