Simple, beautiful, beyond smart
1st Mobile with ICS Samsung Galaxy Nexus.
From the user perspective ICS got
huge and great changes to keep the androidhood alive.
Easy multitasking
Rich notifications
User defined home screens
Re sizable widgets
Deep interactivity
From Developer perspective ICS introduces many new API and capabilities. Here are some main features.
Unified UI toolkit: A single set of UI components, styles, and capabilities for phones, tablets, and other devices.
Rich communication and sharing: New social and calendar APIs, Android Beam for NFC-based instant sharing, Wi-Fi Direct support, Bluetooth Health Device Profile support.
Deep interactivity and customization: Improved notifications, lockscreen with camera and music controls, and improved app management in the launcher.
New graphics, camera, and media capabilities: Image and video effects, precise camera metering and face detection, new media codecs and containers.
Interface and input: Hardware-accelerated 2D drawing, new grid-based layout, improved soft keyboard, spell-checker API, stylus input support, and better mouse support.
Improved accessibility: New accessibility APIs and text-to-speech APIs for writing new engines.
Enhancements for enterprise: Keychain and VPN APIs for managing credentials and connections, a new administrator policy for disabling the camera.
Check the Android Developer Web and Android Official Blog for more about ICS