Third party iOS developers can now offer auto renewable in-app subscriptions8
Now, offering free trials for iOS apps is much easier. The trial subscription will start right away, and the subscriber won't be billed until the trial period ends. A free trial can be no longer in length than the period of a regular charged subscription. For example, if a developer offers in-app subscriptions that run for a month, a free trial can last no longer than one month.
Apple is even willing to eat some cash to offer this. Like most apps, during the first year of an auto-renewable subscription, the developer receives 70% of the revenue and Apple takes a 30% cut. Once a subscriber's first year of an auto-renew subscription is over, future revenue from this particular customer is split with 85% going to the developer and 15% going to Apple. If a subscriber drops the service and renews within 60 days, the days of service start up from where it left off.
If you're a developer who is exploring offering in-app auto-renewable subscriptions, you should check out Apple's message to App Store developers that can be found by clicking on the sourcelink.
source: Apple via TheVerge