I have a feeling they will add more time to the musical numbers and other crap. I can only see the main event, ladder match, Rusev vs Cena and Orton vs Rollins taking up that much time for them to think about putting the Battle Royal in the pre-show. IMO, Taker vs Wyatt could have long-ish entrances but I can't see them trying to do a really long match and Triple H vs Sting most likely will be a shorter match for Sting to win, but I hope they surprise me. Sting can still go despite his age (reference his 2013 match with Bully Ray at Slammiversary, after that he was quite decent in mostly tag matches) and with a guy like Triple H, anything can happen but I wouldn't bet on it. Shame, Goldust is one of the best veterans in the company and Cody is a star(dust)-in-the-making and the duo could pull off a 10-15 minute long match with a hot crowd at Mania, elevating Cody big time. Same with Mizdow vs Miz.
7 matches on what I'm sure would be a 4 hour PPV is pretty lame.