Oh please!
Teasers and trailers are spoilers according to most people's erronous definition of "spoiler". They offer a glimpse into the film in order to make the masses ask questions and talk about it. Which is exactly what we are doing here after clicking that link.
If I was working on post-production for Spiderman 3 and everyone here would know, then me saying that, say, MJ dies halfway through the movie because Spidey made a mistake, then that would be a spoiler, unless it is shown in a teaser/trailer.
Otherwise it's all speculation until the film is released.