Google releases Android Things Developer Preview 5 based on Android O
As expected, the 5th Android Things developer preview is aimed at developers and early adopters, and it should be used for development and compatibility testing on supported hardware platforms. According to Google, this release may still have some stability issues on supported hardware, so you're asked to send your feedback if you discover any bugs.
Rumor has it, Google plans to launch Android O on August 21, or at least announce the market name of this version of the platform. It's unclear whether or not Google will release another developer preview until then.
source: Google
Things that are NOT allowed: