For all you people out there in Australia, or those willing to pay the import fees, it looks like the 3rd disc is now available for pre-order.
Friendship Is Great At Any Time Of YearTwilight Sparkle does her best to prepare for the upcoming Winter Wrap-Up without relying on magic to help. Apple Bloom is discouraged because she has not received her cutie mark yet so she aggressively searches out her purpose in life so she can get it. When Rainbow Dash and Applejack compete against each other in the annual Running of the Leaves, competition turns sour and the ponies do whatever it takes to win.
Hopefully you are all having luck completing your box sets off! Check the page out here. Thanks to Rhys for the heads up!