updated 01:24 pm EDT, Mon June 24, 2013
Any new feature additions yet to be discovered
[Update: Xcode 5 beta 2 released as well] Apple has begun seeding a second beta of iOS 7 to developers. Because the release is so new, any feature additions or removals have yet to be discovered. The software should, however, concentrate mainly on improving the speed and stability of iOS 7, which only emerged in beta form two weeks ago, at WWDC 2013.
iOS 7 represents a major reworking of Apple's mobile operating system, including a new aesthetic focusing on "flat" icons and translucent layers. Several new features have been incorporated, such as AirDrop filesharing, iTunes Radio, and the Control Center, while others have been improved. Siri for example has gained new voices and commands, and Apple is deepening car integration beyond just hands-free use.
Update: In addition to the iOS 7 second beta, Apple has updated its beta of its software development kit Xcode 5 to beta 2 as well. The unreleased Xcode version is intended to maintain compatibility with the OS X 10.9 and iOS 7 betas, and can only be downloaded from the Mac App Store through a developer account.