Hi,
Short answer - when it's done.
Long answer - dev constantly adds things here and there to the game, just recently he added some relationship-based one-time events, then added some nightly interactions, now he's working on expanding the story regarding Yosuke and also some scenes with side characters. Everything will be added in its right time, let him cook and patiently wait for updates.
Keep in mind that everything is done by one person only, he does the art, the coding, the script, the community only contributes to translating the game so that other may enjoy this in their native language.
Cheers