iOS 7 Features
A new tabbed interface lets you scroll more quickly through open pages (and continue scrolling down to iCloud Tabs); you'll also notice the same continuous-scrolling Reading List and Shared Links features that will appear in OS X Mavericks. iCloud Keychain, a new feature that syncs your passwords between your devices and even helps you generate new passwords, should work seamlessly with Safari.
iTunes
You can create stations based on a song, artist or genre, and rate songs as you go along. This helps you to either hear more like a given track, or never hear anything like it again. You can control the balance of your stations, determining whether they're hit-heavy, whether they favour new-music discovery, or whether they're a mix of the two. The history tab gives you a full list of all the songs you've heard, a convenient feature if you can't remember the name of that one track that had you grooving along.
Apple's streaming service offers the additional benefit of being tied to the rest of the iTunes ecosystem, meaning that you can easily purchase songs from the iTunes Store within iTunes Radio. However, for now iTunes Radio is available in the US only.
Most of the other changes seem to be cosmetic, reflecting the new design aesthetic of iOS 7. Despite the extensive reinvention of iTunes on the Mac that Apple performed last year, not much crossover to iOS is happening - or, if it is coming, Apple hasn't revealed it yet. In particular, we've seen no indication that iTunes 11's Up Next feature has jumped to Apple's mobile platform.
Moments and Collections: The revised Photos app can now group images according to their time and location.
The Rest
Apple's virtual assistant didn't get much screen time in the WWDC keynote, and what time it did have in the spotlight was relegated to a discussion of its new integration features, such as in-Siri results for Bing search, Twitter and Wikipedia, as well as new control features for things such as iTunes Radio.
Siri also boasts some new high-quality voices (for US English only at the moment, but coming soon for other languages) and a fancy revamped interface. Siri doesn't yet have the livetranscription feature that Google recently showed off for its voice search.
iPhone more Secure
Thanks to Activation Lock, a thief who attempts to disable the Find My iPhone feature or to wipe the phone won't be able to do so without entering your Apple ID and password. While dedicated hackers may still be able to find a way around it, hopes are high that Activation Lock poses enough of a deterrent that thieves will think twice before stealing iPhones to sell.
iOS7 in Cars
At the moment, Apple says a dozen car manufacturers, including Acura, Chevrolet, Ferrari, Honda, Hyundai, Infiniti, Jaguar, Kia, Mercedes, Nissan, Vauxhall and Volvo, have signed up to provide support for the iOS in the Car initiative. This will allow a driver to work with the screen in the car to use iOS features such as navigation, phone and entertainment functions.
We can think of a few things that we were hoping iOS 7 would offer that it doesn't yet. For example, the Maps app lacks native transit directions; Siri is missing live-transcription functions; home-screen organisation seems unchanged; you can't set a third-party app as the default web browser or mail client; iTunes has no Up Next feature; and much more. But hey, that just means there's room for improvement.
