It's mostly some revisions for clarification and adding the Apple Watch and TV.
- They no longer cancel subscriptions automatically if the price increases.
- If you don't want auto updates on certain apps, they just say that you should delete said app.
- "Some pieces of Eligible Content may be large or may initiate the ongoing delivery of content based on usage and resource constraints, and significant data charges may result from delivery of such Eligible Content over a data connection."