Simplified App permissions
This feature allows one to chose what kind of permissions that they want an app to have access to. Usually users are shown the permissions that an app requires on first install or when another feature has been added. What's get about this new feature is that users can choose which permissions to grant an app. Instance you can choose to give the WhatsApp app permission to use your microphone or even location. The users has to grant permission to apps on first use.
Apps can now verify that any application claiming to support a link-type are the actual application that its developers meant to open.
This feature is similar to the Apple Pay feature of the iPhone 6 and iPhone 6 Plus. It allows users to pay for goods and services using NFC. The Android Pay can also within apps allowing users to pay for things within apps like Uber or Lyft.
Android M would come with fingerprint reader support within the core OS. The Fingerprint support would allow users to unlock their devices using their fingerprint. And also it can be used in conjunction with Android Pay to verify the user.
This is a power saving feature which allows your Android device last longer between charges. With Doze, your device notes if the device has been moved recently to control the number of times your device syncs.
USB 3.1 Type C support
Android M would come with support for the new USB cable, which allows for smaller ports and faster data transfer. The new USB 3.1 Type C is reversible and makes for easier plugging and unplugging.
Easier Text Select
Android M would allow users to select words easier han before. Usually Android selects text, letter by letter but now users can select by word.
The clipboard nows appears just above the highlighted word.
Simplified Volume controls
Allows users on stock android to control the Sound Volume, Ringtone volume and Alarm volumes independently.