Android Kitkat 4.4 released today. Visit here for more info Android KitKat | Android Developers
Here’s a quick look at some of the new features for developers:
New ways to create beautiful apps — A new full-screen immersive mode lets your app or game use every pixel on the screen to showcase content and capture touch events. A new transitions framework makes it easier to animate the states in your UI. Web content can take advantage of a completely new implementation of WebView built on Chromium.
More useful than ever — A printing framework lets you add the convenience of printing to your apps. A storage access framework makes it easier for users find documents, photos, and other data across their local and cloud-based storage services. You can integrate your app or storage service with the framework to give users instant access to their data.
Low-power sensors — New hardware-integrated sensors let you add great new features to your apps without draining the battery. Included are a step detector and step counter that let you efficiently track of the number of walking steps, even when the screen is off.
New media capabilities — A new screen recorder lets you capture high-quality video of your app directly from your Android device. It’s a great new way to create walkthroughs, tutorials, marketing videos, and more. Apps can use adaptive playback to offer a significantly better streaming video experience.
RenderScript in the NDK — A new C++ API in the Android Native Development Kit (NDK) lets you use RenderScript from your native code, with access to script intrinsics, custom kernels, and more.
Improved accessibility support — New system-wide captioning settings let your apps present closed captions in the style that’s preferred by the user.
There are lot of new features for developers. I will update the post after reading everything.
(Apart from these Nexus 5, Google Play Services 4.0 are also released)