For your first question my friend no one really knows. CARIBDIS said in discord that the game will have multiple versions so it will not finish in 1.0 like Once in A Lifetime as for your second question the game is currently at 38% if you want to be up-to-date I suggest you join CARIBDIS discord and for your last one when the 0.9 come out just change the current rpa file of this version with the new one and maybe the APK too so you can update it hope my tips are helpful 😊
Oh I forgot to tell you Calypso is already added as a heroine in the latest update 0.8.5