Today google released the first android N developer preview – taking quite a few of us by surprise! Previous versions of the dev previews have arrived later in the year.
One very interesting change, is you can now receive preview images via OTA updates: https://www.google.com/android/beta?u=0 . This is sure to be a great convenience for developers who want to test their apps under the preview.
Secondly, as always commonsware has a great write up on the changes in this dev preview. With past versions of android Commonsware has provided some of the best dev focused summaries for the developer previews.