In version iOS 11.2, developers will be able to add a discounted trial subscription to their apps. This way, they will be able to attract more users who can sign up for a trial subscription at a lower price, and later pay the full price.
Apple talked about this change in the postscript to update iOS 11.2 beta 2, but most likely it also applies to tvOS 11.2.
Trial discounts
You will soon be able to give new users a trial subscription at a lower cost. iOS 11.2 contains details about the trial period of the subscription, which automatically renews. The new APIs can be used to display trial subscription information in your apps. Pricing information will soon be available on iTunes Connect.
For now, developers can only provide a free trial subscription, and in iOS 11.2 they will be able to charge a partial price for it.
Earlier this year Apple redesigned App Store to iOS 11. The company changed not only its appearance, but also some of the rules. Apparently Apple continues to change App Store for the better.