As well as announcing the new Google Nexus 7 tablet, Google also announced the latest version of their mobile OS, Android 4.1 Jelly Bean, which comes with a range of new features over Android 4.0.
Some of the new features in Android 4.1 Jelly Bean include, expandable notifications, WiFi-Direct and much more, you can see a list of what is new in Android 4.1 below.
Expandable notifications: Android 4.1 brings a major update to the Android notifications framework. Apps can now display larger, richer notifications to users that can be expanded and collapsed with a pinch. Users can now take actions directly from the notification shade, and notifications support new types of content, including photos.
Android Beam: In Android 4.1, Android Beam makes it easier to share images, videos, or other payloads by leveraging Bluetooth for the data transfer.
Bi-directional text support: Android 4.1 helps you to reach more users through support for for bi-directional text in TextView and EditText elements.
Gesture mode: New APIs for accessibility services let you handle gestures and manage accessibility focus. Now you can traverse any element on the screen using gestures, accessories, you name it.
Media codec access: Provides low-level access to platform hardware and software codecs.
Wi-Fi Direct service discoverability: New API provides pre-associated service discovery letting apps get more information from nearby devices about the services they support, before they attempt to connect.
Network bandwidth management: New API provides ability to detect metered networks, including tethering to a mobile hotspot.
You can find out full details of everything that is new in Android 4.1 Jelly Bean over at the Android Developers Blog.