Nice little rollup and video from AppleInsider. My favorite new Siri things:

• Being able to turn my flashlight on and off
• Asking Siri to find my devices

That second one is more than simply a handoff to the Find iPhone app. It will give you instant feedback if your device is nearby, and will offer to play a sound on the device. This is a very efficient way to locate a misplaced device, all with a single command and a button tap.