New Camera app
Photo Sphere aside, Android's Camera app gets a minimalist makeover in the 4.2 release. The new Camera UI revolves around a ring that appears around your finger anywhere you touch; it contains all the commands you need, including options to change the photo mode, switch between the front and rear camera, and adjust the camera's flash, exposure and white balance.
You can also swipe your finger toward the left on the screen to jump directly to the Gallery and view your most recently captured images. With a couple more taps, you can edit any image right then and there -- using a series of filters and built-in tools -- and share it to any service you want.