SonyRumors: Sony has revealed the Stereo Microphone STM10 for the Xperia Z2 and Xperia Z2 tablet, bringing with it a high sensitivity stereo condenser microphone with a 90 degree tilt function.
It's useful for those people who don't want to get a "proper" camera for video. There's so many people who use their phones for video and photos, and this is a great accessory to help them get better quality content.
Accessories like this can always be great though not sure how big the market for this isnn