Client-server apps sounds an awful lot like "web apps" to me:
Apple TV also makes it easier to create client-server apps with custom user interfaces that are consistent across multiple apps. You build these client-server apps using web technologies such as HTTPS, XMLHTTPRequest, DOM, and JavaScript. You use Apple’s custom markup language, TVML, to create interfaces, and you specify app behaviors in a TVML document using JavaScript.
UIImageView now supports parallax effects (I'd imagine this also applies to iOS apps):
Your parallax images are going to be created by your designers. But how do you get them into your app? The UIImageView class has been modified to support parallax images, so in most cases you only need to make minimal coding changes.
No persistent local storage is kind of amazing. Wonder how long until we see this rule spread to iOS apps:
There is no persistent local storage for apps on Apple TV. This means that every app developed for the new Apple TV must be able to store data in iCloud and retrieve it in a way that provides a great customer experience.
Along with the lack of local storage, the maximum size of an Apple TV app is limited to 200MB.