asriel probably won't appear as toriel says in chapter 1 : ''when ASRIEL returns next week,'' a week is 7 days, there are 7 confirmed chapters, we would need a chapter 8 if we want to see him when he is supposed to come back.
what i would like to see:
-a roaring fraud rematch in chapter 6
-the roaring happening at the end of the game
-chapter 8 happening (i call that toby will add chapter 8 just to troll everyone)
-the weird route actually having a different ending
-watercooler
-another 3 LEFT =) reference
-access to the castle town one final time in chapter 7
Susie x Noelle becoming cannon (it's possible).
Asriel appearing.
Continuation of Snowgrave.
Dark World in the entire School.
More Ralsei character development.
Actually seeing Mettaton. Things I want to see in future DR chapters