Club Penguin uploaded the files for their next two pins even though they cannot be obtained in-game yet. Thanks to this “leak” we now know what the next two pins are and what they look like.
First off there is a Purple Crown Pin. There’s also the Descendants apple logo, but without the “D” for Disney on it. Here’s what the two pins look like:
It is unknown if they’ll be hidden on the island or if they will be obtainable at the party. Seeing how a new pin was hidden just the other day I would guess they’ll be collectable at the party somehow.