Lauren Goode, writing for The Verge, on Phil Schiller’s subscription comments:

Schiller imagines scenarios where many kinds of apps that were previously single-time purchases could move to the model. Games that have an ongoing subscription-like program, ones that have a massive online playing world that require upgrades of game worlds, might make sense. He suggests many enterprise apps could move to subscription, and that professional apps that require “a lot of maintenance of new features and versions” would be a good fit.

Taking Schiller’s comment at face value, it does sound like developers of productivity apps will be able to experiment with subscriptions. “A lot of maintenance” applies to most of the apps I have on my devices, which use the classic paid-up-front model.

Also from the article, this semi-hidden note on a new subscription management UI coming to the App Store:

The App Store will also have a revamped interface to make it “even easier for users to manage subscriptions,” he adds.

I’ve been saving a “finally” for these buttons that are still around in iOS 9.