A Look At The Changes In The Android M Preview
 

Today during Google I/O 2015's opening keynote Google announced the latest release of their Android operating system. The new version of Android is using the code name Android M, much like how Lollipop was initially referred to as Android L. While Android Lollipop was a major release with many new features and a comprehensive redesign, Android M goes back to basics, and focuses on polishing what Google introduced with Lollipop. That isn't to say that there are no new features or design tweaks, but they are not on the same scale as Lollipop's changes. It may be best to think of Android M being to Lollipop what Jellybean was to Ice Cream Sandwich.

http://www.anandtech.com/show/9297/a...roid-m-preview