Walt Disney Pictures has dished out the second trailer for Pirates of the Caribbean: On Stranger Tides, which expands the scope of the story more than the first trailer. This trailer reveals some mermaids and a glimpse of Keith Richards, who is reprising his role as Jack Sparrow's father.

Astrid Berges-Frisbey stars as the mermaid Syrena in Pirates of the Caribbean: On Stranger TidesHe explained that, in the script, they were described as very beautiful, but at some point, they became animalistic, tearing the sailors apart. They landed on the idea that while the mermaids were in the water, they were these fierce creatures, but when they were out of the water, they appeared to be human women. {27} also explained that {28}'s character, Syrena, would be the most beautiful of all the mermaids, and her sisters would be the more evil and animalistic mermaids.
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Johnny Depp and Kevin R. Mcnally