I hope so

I think it should be the tutorial mode of the game.

Nautiloid in hell should be chapter 1, when the story actually begins.

They don't need to fully spec it out so that a Tutorial prologue is specific to every character class/background etc, it could be more generic. Like here you are at an Inn in Baldur's Gate, where you can kit out and buy a drink, learn the UI by engaging in some focused tutorial stuff. When you leave the Inn is when the mind flayers grab you up off the streets ala opening cutscene. You don't need a whole separate prologue for a warlock or a drow or whatever. All you need is for the character to have some reason to be in Baldur's Gate when the attack happened.

I think making a simple Tutorial Prologue that starts out with the normal "roll up a character and buy their starting gear" pre-game type scenario. Basically a BG1 style start for character creation and tutorial, that cuts to a BG2 style start for the first chapter of the actual adventure (which would be the current Prologue in EA).