Android M Preview was introduced to the developers in Google I/O 2015 event, the M Preview is know as API 23 rc, MNC preview was the first of the series of previews that are expected to released until July. Android M API and other SDK tools can be download from the Android Studio SDK Manager.
Google has set up a timeline for the updates to be expected and when, the M Previews would be rolled out in 3 Preview versions until final SDK release.
Android Official developers website : https://developer.android.com/preview/download.html#sdk lets you download the latest SDK and other informations. It is also possible to get the Preview versions installed on the Hardware devices that are running on Nexus 5, 6, 9 and Player for TV apart from emulators of course.
The Android M SDK Platform is available under tools Preview Channel in SDK Manager,
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