Today, Google announced Android 5.0 Lollipop which will ship with the Nexus 6 and 9 and will also be available for the Nexus 4, 5, 7, and 10 in the coming weeks.
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New features:
Material Design:
A new UI instead of the same one every update.
Notifications:
Even less intrusive notifications. A way to control when you get notifications.
Battery:
Adding a longer battery life for all devices instead of lowering it like other operating systems.
Security:
Lock to apps so when you show someone a photo on your phone, they can't go through your texts. Encryption is enabled by default.
Runtime and Performance:
ART runtime. Up to 4x faster than Dalvik. Support for 64bit devices.
Tap & go: instant set up of your new Android phone or tablet by simply tapping it to your old one (requires NFC)
Full list here: https://android.com/versions/lollipop-5-0/
Android: Be together. Not the same.