Sue and Coach Dejerdan (sp?) survive the massacre in the novel. Sue, for obvious reasons, and I wanna say the coach gets several students and herself out a back door that Carrie missed somehow.
In the film, Buckley talked about how the Coach couldn't survive because it made the "OMG what is wrong in this world?" all the more realistic.
In the remake, a handful of students, the Coach and Sue survive, and it uses the framework of the police interrogation to tell the story.
Honestly, I really like the idea of Sue narrating, particularly if they are using that framework.
The novel has one of my favorite lines towards the end, when they are still attempting to pin all of it on Sue. She says (paraphrased as I don't have time to find the quote):
We were just kids. Tommy was 18, Billy was 18, Chris was 18, I was 17 and Carrie was 17. This wasn't some vindictive attack planned by adults, we were kids.
http://www.youtube.com/huskcharmer