Developers can now Offer In-App Purchase Promo Codes
Developers have been taking advantage of the promo codes from Apple for some time now. What these codes are used for is to offer a free download of the app to someone. This is mainly given to reviewers so the app can be reviewed and the person doesn't need to pay for it. Now, developers can offer promo codes for in-app purchases. This would be helpful if a developer wants someone to also review the app with one of the in-app purchases enabled. Or a developer can have just the in-app purchase reviewed.
However, this has not been pushed out to all developers yet. There have only been a few developers who have got this option. If Apple is only pushing this out to a few people we are sure that it will come to more as the testing proceeds.