The wait is over! The 2015 Disney Hidden Mickey pins have finally been announced for WAVE A! They are being rolled out in the parks right now. All pins are expected to be available by the end of April 2015.
Here are the Disneyland 2015 Hidden Mickey pins wave A:
Here are the Walt Disney World 2015 Hidden Mickey pins for wave A:
Hidden Mickey pins are released twice a year to Disney Cast Members to be traded with guests. You can only find Hidden Mickey pins on Cast Member lanyards, and of course other park guests once they acquire the pins. Hidden Mickey pins cannot be purchased when they are first released.
-Disney Pins Blog