Alice and Norah content is not completed yet as Alice quest will continue in later versions.
About Ms. Kimura, no other characters will have starmaker pages. Himari and her have a chance to get more content.
Anna receives new content every version. More solo interactions are planned for the future. No selectable outfit for gameplay is planned as the amount of work for a side project would be increased by a lot, but more specific actions for specific outfits are planned, like the golden bikini during movie night.
There wont be a "Starmaker 2" but theres a chance for a spinoff to happen, not guaranteed, just a chance. (It wont have any of the current characters nor it will be in same location)