From Twilight Lexicon:
WARNING! There are spoilers here, so look away if you really don’t want to know!
For the first clip, Jacob shows Bella how to work the bike, and as she reeves the engine a “ghost” of Edward appears. This spurs her on and she heads down the road passing multiple “ghosts” on her way until she crashes. Jacob rushes to her and worries over the bleeding gash on her forehead. She apologizes for the blood, to which he says, “it’s only blood, Bella,” and removes his shirt so he can use it to clean her up. Bella gives him the once over and tells him he’s kinda beautiful. He then asks her is she maybe bumped her head too hard.
The second scene was of Alice and Bella driving through Volterra surrounded by the people in red robes. Bella darts out of the car and rushes through the crowds toward the clock tower. She sees Edward just as he is opening up his shirt and getting ready to step out into the sun. She darts over though the fountain telling him to stop and then… the footage ends. Great teaser there!