Really now? I'll have to admit, I was spoiled about Hans a full three months before Frozen's release because I made the mistake of visiting its IMDb board. However, I watched the movie many times with people who weren't spoiled and they were all "Oh nooo!" in great dismay at the reveal. Later on, most of them told me they were expecting Hans to end up with Elsa, especially once he arrived at her ice palace. Similar to Enchanted, where the couples ended up switching. Nobody I knew suspected him to be a wolf in sheep's disguise at all.