That's interesting news about Eliza's story mode! They seem to make each one bigger than the last!
Not to sound negative, but I reckon part of the reason Eliza's getting so much lore in her story (besides being a favorite of Alex's and being an central figure in the overarching story) is because this is sort of their last chance to get certain bits of lore in, not including any potential sequels. I mean Beowulf probably won't add too much to the overarching story.
Now, Squigly's story had more cutscenes/dialogue than the launch characters, and also had some formula breakers like a tag partner and an alternate final boss. Big Band had even more dialogue, a conversation before every fight. So I assume Eliza will have a couple formula breaks and she'll have to meet every member of the launch cast (DLC can't appear in storymode right?). Maybe Isaac, Delilah, The Trinity and Filia's heritage will all finally be discussed.
Okay final bit of my mega post, remember how the empty version of Lab 0 got modified before Big Band's story came out and we all kind of silently agreed it was going to be a big part of his story? Well now there's that alternate version of Medici Tower where Ottomo and Vitale aren't there anymore. I think it's possible Eliza will have a fight in Lorenzo's office at some point of the story, either protecting her blackmailer from Fortune/Peacock or fighting Cerebella so that she can kill Lorenzo herself.
That's my two cents.