
Now let's see what's new to be in its new version?
LOCK SCREEN
In its new version Lollipop, Google planned to give to its users a comfortable and easy way of responding notification that were displayed on the lock screen. Once notifications displayed on the lock screen, you can reply to the notifications(for example text messages) without dig deeper into the operating system.
If you want to keep some notifications hide from others, you can turn off lock screen notifications for certain apps. Further, the OS is now smart enough to prioritize which notifications you need to see the most, arranging them in order of importance.