The first two movies, the third one is going to be completely OC.
Here's a list of the main differences between the movies and the anime: http://wiki.puella-magi.net/Madoka_Magica_Movie#Observation
Then again, there's a new scene after Sayaka and Kyoko die, a place that looks like a graveyard. I've asked and lurked around but nobody knows what it could be.Also, the credits have more new material, pic related.
By the way, I read yesterday some guy wanted a stream, I'll ask Administratum later if they want me to stream it this weekend.