If you have Pirate & Nobles, the opening sequence changes... instead of the narration that starts with "You are the watcher..." there are various scenes of Pirate & Nobles Sims and no narration. There are also additional quests, one of which allows you to turn your Sims into a Pirate and another that allows you to turn your Sim into a Noble. Hope that helps.
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To purchase Pirates & Nobles, I suggest trying Amazon.com.
@Crysnia wrote:
I recently reinstalled Sims Medieval on my computer. I hadn't played in almost two years. I noticed a popup about Pirates & Nobles when I installed it but didn't pay attention. How do I tell if I have Pirates and Nobles on my version and if I don't, how do I get it (I can't find it in the origin store).