Android M Developer Preview 3 delayed, will be a "near final" release
Following Android M Developer Preview 2, this month, Google was supposed to launch Android M Developer Preview 3 for select Nexus devices. However, we're now learning that the release is being delayed. The info was shared by a Google employee via the Android M Developer Preview community page on Google+, so it's as official as it gets.
Google is expected to introduce not one, but two new Nexus smartphones as the world's first Android M devices: one made by LG, and another one made by Huawei. Both could be released in October. That's also when Android M should get its final name, as well as a version number (which will likely be 5.2, not 6.0).
source: Google+ via Android Police
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