Texture seems to be the key word right now. Brides are wanting cakes with lots of ruffles and petals to be the show stopper at their wedding. Some cakes are done entirely in ruffles or petals some just have an "accent" tier(s) that brings different textures into one complete design. These cakes are beautiful to look at but attempting to serve one can prove pretty difficult. Cakes designed in fondant are fairly soft so serving it shouldn't be a problem. Cakes that designed with gumpaste whether due to weather conditions or general design stability are more problematic. The gumpaste would need to be peeled off so that the cake can be cut and served or... a better and less expensive solution... decorated on a "dummy cake". A dummy cake is a styrofoam cake form used to make taller cakes that are less expensive, as sections for more intricate design, are in place of an expensive wedding cake all together.
Another popular textural design is Demask, this is a lacey design that can be cut from fondant but more commonly stenciled on a cake. This design gives your cake an elegant and classy look without tons of fondant work... perfect for those that don't like the taste of fondant.
To most brides, the cake is one of the most important things that her guests will see and oogle over at her wedding... aside from her wedding dress, of course. The cake has to elegant, eye-catching, and unique... providing different textures and pops of color will do this.