It said '4' and her greatest hits in the announcement. It was always gonna be the entire '4' album but that's not all it was gonna be. That would only take up like an hour.
Its the cut of the dress making her waist appear wider than it is. Her body shape is not made for draping and she should never wear it unless its at the bottom, nowhere near the waist. Her entire silhouette is based on the shape of her waist and back, so when she covers them up she looks like a rectangle instead of a coke bottle.
Wow! Talk about paying close attention to details.