Remember the times when you watched a trailer and didn’t know the whole movie?
According to an article on http://www.vulture.com “(…)the National Association of Theater Owners (NATO…) is pushing to limit the length of trailers to two minutes”, after getting bad reactions for the new Man Of Steel preview, which is 3 minutes long. If you give away too much in a trailer, who wants to see the movie? For movies like Evil Dead it might work because it didn’t have a plot in the first place, but I think for DC or Marvel movies it is not even neccessary. Instead of showing everything just show some nice special effects, a few punchlines and call it a day. I would even set the standard to 1 minute or 1:30 minutes per trailer, and maybe release more than one.
Let’s hope the request from NATO gets through and we will see trailers in the future that are 30 seconds shorter, and hopefully save a little mystery.