A new Google Glass app called Preview does just as its name suggests: it plays movie previews. But, it will play them when you're looking at the corresponding movie's poster.
Though Glass is still a ways away from being released to the public, a few thousand people have been able to get their hands on an Explorer version of the device. Luckily for them, they can try out new shit like this (when they're not getting beat up at bars.)
Preview for glass is a future application for Google Glass that changes your movie life. With Preview, when you are go to the theater and look for a good movie, you don’t need to take your smartphone out and type a movie title in search box to see if you are interested in it. Preview allows you to watch a movie trailer instantly by just looking at a movie poster.