Android M aka Android Macadamia coming to Google I/O

"Android M is apparently known as Android Macadamia Nut Cookie among developers working on the newest build of Google’s mobile operating system. Although the Android M code-name Macadamia Nut Cookie is only used internally, there are industry voices saying that we should see the new software being launched at Google I/O which is happening between May 28 and 29."