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)
That would be Ken, no other plans for others to become closer to Anna. She has the extra park scenes for the slut route for your second question.
no animated scenes are planed to be implemented, only the animations during minigames. This is because of the time for production and work, remember this is a side project, its a matter of:
Current amount of content per version vs 2-3 animated scenes.
1. No plans on any body parts expansion.
2. There will be pregnancy, but it wont be a system per se. More like a series of events. Is not set in stone yet how it will be handled, but it wont be a "pregnancy system"
if you are talking about having one on the game I ain't found it. if you are talking about the windows menu I typically have some kind of music playing so I dont mess with my sound but honestly I dont ever need to use the windows menu i'll be honest I forgot about it and will apologize for not thinking about that but to be fair most games have built in sound controls so It doesnt come up often. 
