We know plenty though. and at this point, they haven't revealed any of the bigger changes. So far it looks exactly the same as previous. The only difference is they removed key scenes. Now again, their main focus is of course changing it to be a single story.I think you've misunderstood the point a little. You originally said that the removal of Stella didn't make sense. The question here isn't whether or not Stella had a goal, it's about whether that goal fits in with the storyline as it now stands. Like Abstract Debauchery said, as stories develop, particular characters and the roles they may become obsolete and no loner serve a function. Although the developers are trying to keep a lot of the original story they can't keep it all in light of recreating the game as a stand alone title rather than a spin off. We don't know the current story so we can't say whether or not they could keep Stella in due to the newer additions and development in the game's plot; which again, we know nothing about.
And this is exactly what i'm trying to say....lets say i revealed a character.....i already confirmed their name, and their goal, and what kind of use. Lets say someone else comes in takes over. Regardless of the situation, they remove the character all together and changing it to another character.
NOW.....this is where the opportunity of the audience NOT KNOWING can benefit them and using that character differently or adjusting it to the point where its suited. At this point Luna doesn't appear like a necessary change, but one that appealed to them the most.
Keep in mind when they are talking about changes in order to be a numbered game, they are not talking about characters, they are talking about story-wise what they need to do to be considered one, and so far the highlight is that it stays as one game, not multiple.
The "epic" versus could no longer exist. but that doesn't mean characters have to be gone, REGARDLESS OF WHAT WE KNOW OR NOT. you misunderstand the value of "not" knowing allowing the writers to use them differently without us knowing.
But now we have an entirely different character, which i feel was unnecessary to do. One of the reasons they removed her was lack of understanding who she was. Not because she posed a threat for the story.