I think that there’s a possibility that Ariel and Hook could have met in the past, even if he is not her Eric. In Ariel’s beginning (the third little mermaid movie) we learn that Ariel’s mother was killed when she was crushed by a pirate ship. In S03E01 of the Little Mermaid tv series, Sebastian ends up on a pirate ship and they have to rescue them.
As well in the official podcast (I forget which episode) they said that they are going to be exploring whether someone can find true love again.
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Proud Keeper of the Dinglehoppers