New Characters are Inevitable
One fact that many are overlooking is that although we hardly have been told anything, a major component of the marketing campaign is hyping up the character roster. As early as Oct 2024, Keegan mentioned meeting "old favorites" and "deep cuts", and Chris Meledandri reinforced that same sentiment a year later. This isn't by accident, they are telling us that the characters are (one of) the biggest highlights of the movie.
Yes, the characters you are hoping to see can make it; NOBODY is deconfirmed yet. You are not delusional for having hope when they are directly telling us more characters are to be announced! With only 2 months to spare, it's only a matter of time before the next wave of characters (hopefully more than just 2 this time). Best of luck.