Like the title says, author the Twilight Series, Stephenie Meyer will make her second cameo of the franchise in the movie version of Breaking Dawn - Breaking Dawn Part 1!
She is in the trailer (already posted it!) at about 55 seconds on the left side of the screen. She is attending the wedding!!
"No story lives on unless someone wants to listen. The stories we love best do live in us forever. So whether you come back by page or by the big screen. Hogwarts will always be there to welcome you home." -- J.K. Rowling