If they were going to do a proper teaser, they should have only done a 15 - 30 second pan from the feet of the table to rose is on up to the actual rose. Hold a beat, the slowly bring Emma into focus as she slowly reaches out for the rose. As soon as she's about to touch the glass, we hear either a roar, or a giant stomp, or a door slamming or something, hard cut to black.
A minute and a half of boring set shots.
I am excited for the film, but I just feel like they could have given us more with less.