Disney world movie previews

[Wvmom]

So, probably a silly question. I have never been to a Disney world movie preview or to Disney world at all yet, so I just don't know.
I have a feeling that there could be a preview of an upcoming movie while I am there (as there is a big movie coming out not too long after that) and I am just trying to gauge if that is something we might like to attend.
When Disney says it will be doing a movie preview at the park how much is shown: a regular preview, an extended preview, does it pass the threshold where some previews show so much of the movie that you worry they ruined any surprise, or somewhere between these?

 

[Model3 McQueen]

Usually it's a 10 - 15 minute (extended) preview of the movie that warms the audience up to the feature film.

They serve no real purpose other than to remind you to pay and see the movie in theaters.

 

[larryz]

We've attended a world prem-EAR event on board DCL, and received a button as a memento.

 

[JIMINYCR]

Weve been before. They arent any different than other previews. They give you some selected scenes to build interest, give you enough of a taste to get your heart pumping and make you remember the film enough to want to go see the whole thing when you see it come to your home area theatre.

 

[HonorableMention]

They're essentially an extended preview, maybe ten minutes at the most. Obviously they want you to actually spend money and see the movie, so I wouldn't worry about it spoiling too much.