Apple launched an entire new page highlighting its commitment to security and privacy, with CEO Tim Cook even writing a letter to customers regarding the company's commitment to privacy.
There are many updates to security that you can read about here, but one new change we noticed was that Apple can no longer decrypt iPhones for law enforcement if the device is running iOS 8.
On devices running iOS 8, your personal data such as photos, messages (including attachments), email, contacts, call history, iTunes content, notes, and reminders is placed under the protection of your passcode. Unlike our competitors, Apple cannot bypass your passcode and therefore cannot access this data. So it's not technically feasible for us to respond to government warrants for the extraction of this data from devices in their possession running iOS 8.
Even if Apple was required to decrypt and extract the information on an iPhone running iOS 8, it would be impossible to do so if a passcode was enabled on the device.
iOS 8 also randomizes Wi-Fi mac addresses to prevent companies form tracking your movements when scanning for Wi-Fi networks.
You can read all about the technical side of iOS security here