I guess nyx isn't satisfied with her work in the past. she has a better graphics card and got skilled more as she worked on the past 9 episodes
the houses look differently now, car, haircuts... some text is different
renders are higher quality... although she overdid it with light and shadow play
as for coding, you had to rely on a guide to see certain options and some of the decisions the characters had made no sense. so she's rewriting those parts as well
for instance, to get some elena scenes, you had to hit 100% of her points in your decisions to get on her path and see all her (nonlewd) content
so this is, at least coding wise, for the best. new renders are going to take lots of time but they're more visually pleasing