28 Years Later is directed by Danny Boyle, the same director of the original. Alex Garland wrote the original. Garland and Boyle wrote 28 Years together.
Normally I'm the same way; nearly every movie I've been excited to see in theaters, I've made a point to avoid the trailers for it. But with 28 Years Later, I was excited to see the trailer again when I went to a movie, after already watching it intentionally. It's what a trailer should be, instead of the usual "here are the best scenes, funniest jokes, and every major plot point" we usually get