Bill Condon has mentioned that both Breaking Dawn Part 1 and Part 2 were cut down quite a bit from what was filmed, so it makes sense that there are scenes that weren't in the movie. The fact that neither the DVD nor the Blu-Ray Disc version have any deleted scenes on them imply that Summit is planning on either releasing extended editions of the movies, or at least re-releasing the movies with more bonus features.
Extending this movie even further ? Ugghh no thanks. What will that involve ? An extra 40 seconds on top of the 5 minutes 27 seconds that Bella spends looking at her stomach in the mirror ? or maybe jacob walking up 5 flights of stairs at the Cullen House instead of only 3 ? Seriously, there is no action in this so why extend it further ? or are we going to get more wedding guest speeches ? - it was two hours too long to start with. The only exciting part was the last 5 minutes with the Wolf - Vampire fight and ironically enough, that was an invented scene that never happened in the book.