Regarding Act 4, for those who remember and those who didn't know, Mia's character model will be receiving a slight update. A Patreon poll was conducted way back in June of last year (almost one whole year ago, scary when you think about it) to choose between 3 options, and the winner was A.
What's also interesting to note, if you can see past the 4 gorgeous girls, is the room behind them. There are assets here from the
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and the MC said he wanted to become an architect in Act 3, so maybe this is foreshadowing where we will find the MC in Act 4, either studying architecture or working for a company.