Android M vs Android 5.1 Lollipop
Android M isn't going to bring major visual changes to Android but it will be bringing loads of changes and features that you need to know about.
Google outlined a number of Android M features on stage at Google I/O. If you tuned into the live stream (or if you were there) you probably caught some of them. Google didn't announce every Android M feature on stage though.
We've been enjoying the developer preview and looking for some of those smaller features not mentioned, and here's a comparison of what's new. This is a great place to see most of the changes thus far, as well as more information regarding what's coming next.
It's recommended that both developers and users get familiar with Android M before the actual release date, but if you don't own a Nexus device you'll have to wait for the actual software update in Q3 of this year. Google has a lot planned, and Google Now on Tap looks to be one of the best smartphone features in years.