Just posted the 1.5.8 update. With this update you get the new Shake & Snap feature and you can install the new Festive Frames for the Holidays.
Shake & Snap is an options you can find just under the Voice Controls. When turned on, you are able to snap a photo by shaking the camera. There's a 1.5 second delay before simulating the shutter button. This is very effective with voice response.
I personally wanted this feature for when I'm skiing and riding on the chair lift. Sometimes Voice Controls are out of range and I didn't want to keep my gloves off. So I set Shake & Snap On and Auto Save On and I'm good to go, all nice an warm. Pretty slick trick!