Recently Kitkat’s messaging and phone app leaked and you can have a look at them in the pictures. Not many changes are known as off now, but definitely the color scheme has been changed as compared to the ICS and Jelly bean versions.
The new look seems more compelling and interactive as compared to the previous versions. Also one more thing noted is, the status bar changes the color according to the app. As in the images for phone app it is Blue, while for the Messaging app it turns to green. And much more interesting features and gestures can be expected with this leak. Hope we get the full scenario soon.
More pics attached here: