Polo Field: Coming Soon... New Stamps

A few days ago, Polo Field posted a Reviewed By You post on the Club Penguin blog and it seems that post relates to this post he made a few hours ago:

Coming Soon... New Stamps

How do you think you'll earn these Stamps? Give us your best guess!

What could these stamps be? A new game? This could also relate to a tweet Polo Field made?

There’s something very cool coming soon for puffles. Can’t say too much just yet, but I think players will dig it. :)
— Polo Field (@polofield) June 7, 2013

Something 'cool'. 'Dig it' Notice the words? Maybe an expeditition for the Golden Puffle. Who knows?