Android Lollipop- 5.0 is latest operating system launched by Google for smart phones, tablets and smartwatches. The new nexus 6 and Nexus 9 Tablets will be among the first devices to run on it and before the end of this year (2014) it will be set to available with the new HTC and Sony smartphones to become the first smartphone devices to use this new feature, along with this The Nexus 4, Nexus 5 as well as Nexus 7 and Nexus 10 tablets will also get benefited.

Why Android L 5.0 is different?
It is different because of it's new features and the eminent or notable changes brought in technology.

Latest Look- (Material Design)
This Version Android 5.0 version is different and more attractive then Android 4.4. Material design is a new interface use by Google as it's a more dynamic and make more use of interface by making interfaces flat and simple as possible which has not been used in recent trend of UI designs.

Battery efficiency optimisation (Project Volta)
The Android Lollypop 5.0 have included a changes in battery saver mode along with some new battery features in respect to Android 4.4 it has more battery saving capability also when you plugged in your device for charging the lock screen will show you how long your device will take to charge rest empty battery.

There are some other useful features which are mentioned below
1. Real-time Shadows
2. Redesigned nav soft keys
3. Dynamic 'heads up' notifications
4. More coherence across tablets, phones and PCs
5. Redesigned G-mail Expanded notifications
6. New lock screen notifications
7. 3D multitasking
8. Direct links to apps from Google searches
9. 64-bit CPU support
10. Android TV
11. Improved GPU support
12. ART runtime is in
13. Smartwatch as authentication
14. Support for USB audio
15. Bluetooth 4.1 support
16. Android Auto

For detail information about features please click on the below links-
1. http://www.trustedreviews.com/opinions/android-5-0-l-features-list-what-s-new
2. https://developer.android.com/about/versions/android-5.0-changes.html