This morning Android M was introduced by Sundar Pichai at Google I/O 2015. There it was revealed that this software would be brought in the form of an Android M Developer Preview first, then released to the public. This is much in the same way that Android L, eventually Lollipop, was introduced to the world. This version of Android - M - will have Google going "back to the basics." That means functionality and "improving the core experience." This version of M will be released within weeks for developers - if not sooner.