something that seems to have been missed by a lot of people :
Inusuku has (with Imouto Fantasy) laid the groundwork code-wise so they can copy and paste things like skills over to a new game, which we are seeing with Imouto Encore, as the stat screen and skills (and I assume, the coding) are pretty identical besides layout.
couple this with the artist they have hired and I can easily foresee Imouto Encore coming anytime 2025 (I'd even dare to say as early as Q2) depending on how many new systems (like the phone function) they implement.
have a pic or two :
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is... is that scrollable room I see?