Pin unlimited number of images: Pinterest Automatic Pin Plugin can pin from one image to all images in the post directly to your pinterest account. Post featured image as a pin: Plugin can pin featured image to pinterest. Scheduled posts support: select images to be pinned and once your scheduled post get published it will be pinned.
Demo: http://codecanyon.net/item/pinterest-automatic-pin-wordpress-plugin/2203314
Demo: http://codecanyon.net/item/pinterest-automatic-pin-wordpress-plugin/2203314