Catherine Shu reporting for TechCrunch:
[…] If you made the subscription online, the law stipulates that you are also allowed to cancel it online. In other words, you can no longer be forced to call a customer service phone number to stop the service, a task that is usually much more frustrating and time-consuming than signing up in the first place. […]
If you sign up for a subscription at a promotional or discounted price that is only valid for a certain amount of time, the company must get your consent again before charging your debit or credit card when the price returns to its normal rate.
All these things seem like stupidly obvious consumer protections.