My Thoughts on Apple Subscriptions
Apple launched its in-app subscription plan, after the launch of Rupert Murdoch's iPad only magazine The Daily. I have read the official statement from Apple. The service now is open to all content providers, for each subscription sold through the app, Apple takes a 30% cut. Publishers can set the price and length of a subscription, also can offer subscriptions through their own existing websites but would be required to offer those same terms to anyone signing up through Apple.
Subscriptions purchased from within the App Store will be sold using the same App Store billing system that has been used to buy billions of apps and In-App Purchases. Publishers set the price and length of subscription (weekly, monthly, bi-monthly, quarterly, bi-yearly or yearly). Then with one-click, customers pick the length of subscription and are automatically charged based on their chosen length of commitment (weekly, monthly, etc.). Customers can review and manage all of their subscriptions from their personal account page, including canceling the automatic renewal of a subscription. Apple processes all payments, keeping the same 30 percent share that it does today for other In-App Purchases.
...Apple does require that if a publisher chooses to sell a digital subscription separately outside of the app, that same subscription offer must be made available, at the same price or less, to customers who wish to subscribe from within the app. In addition, publishers may no longer provide links in their apps (to a web site, for example) which allow the customer to purchase content or subscriptions outside of the app.