In what looks to be a long awaited move to embrace developers and open up their API, Pinterest has created an area with the beginnings of organzed documentation.
Check out:
http://developers.pinterest.com/
and/or
http://developers.pinterest.com/developer/
and you will find an area with information on the new rich pins, aka “more useful pins”. The developers area also includes links to more information on:
Rich pins
iOS Pin It SDK
Android Pin It SDK
as well as a few tools including the rich pin validator and Widget builder.
The biggest sign of hope for a developer API hook is this manage your apps area to Keep track of the client IDs for your mobile apps.