Today at Google I/O, Google announced the latest version of the Android platform, Android 4.1 (Jelly Bean), which will includes improved system performance and enhanced user features.
Improvements include a smoother and more responsive UI across the system, better CPU management, a home screen that automatically adapts to fit your content, a powerful predictive keyboard, richer and more interactive notifications, larger payload sizes for Android Beam sharing and much more.
Google also is expected to release a new Nexus device, except this time it is a tablet. Rumored to be called the Nexus 7, will have a 7-inch screen, a quad-core processor, made by Asus and will be priced at $199.
Source:- Android 4.1 Jelly Bean