Today the cast of The Force Awakens is participating in an official Q&A on the official Star Wars twitter, and Harrison Ford accidentally dropped a big spoiler.
Someone asked Harrison what his favorite action scene in the movie was, and he responded with the Tweet below. Here’s a link to the original (and an archive here in case it’s deleted) and here’s the screenshot:
This is something those familiar with spoilers have known for a while, but it’s a pretty major one to put out there that Rey has a lightsaber fight with Kylo. It spoils one of the big reveals in the movie.