What probably happened is around the time that picture surfaced the Moonlight Memories series was announced and they figured having these items out at the same time would seem kinda stupid lol
Will they ever release the Proplica Star Locket though?
Nope. It was pretty much the same as the Moonlight Memories series. It would've been great to see them remake a Star Locket like the one in the anime (using digital imagery in the inside instead of the wind up music box idea) Apparently Proplica had made items for other magical girl series (Creamy Mami and Ojamajo Doremi) but also scrapped those ideas as well.