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The update will bring usability improvements, live music control keys from the lock screen, closing apps by swiping down by default and NFC tag reading.
The N9 features a 3.9 inch display with an 8MP camera and is powered by a 1 GHz processor. Its touch only UI utilizes swipes and gestures to navigate through the entire OS which has been simply divided into three categories - all apps, running apps and messaging. The 8MP camera on the device is one of the best cameras to date from Nokia.
A white version of the N9 was introduced by Nokia today. It features a glossy finish unlike the matte design on the other device, and it will be the first N9 to feature 64GB of internal storage.
source - Nokia Conversations