I'm pretty disappointed in the dress, based on what we can see of it in that picture. I agree with you - I liked the finale sneak peek one better. This one looks a little off-the-rack department store to me... aka not exactly Queen material.
I find that sometimes the show's wardrobe department's translation of iconic dresses/looks can sometimes be pretty disappointing (though I do think they knock it out of the park quite frequently/in general). For example, I found Cinderella's dress to be such a let down: