Club Penguin Polo Field Teases New Stamps Coming Soon

Today, Polo Field revealed that there'll be three new stamps coming to the Club Penguin island. I don't know what the're for but they all have a blue puffle on them. As shown below these stamps are green (easy), yellow (Medium), and blue (Hard). Take a look at the sneak peek image below:

As you can see, they all have coins on the stamps. I wonder what that means. Maybe there will be a new game coming out on the club penguin island. What do you think these stamps will be for? To let me know what you think these stamps will be for you can leave a comment below.