October 4 will not only be important for Google for the presentation of all those products, such as the Pixel, Google Home, DayDream viewer and Chromecast 4K, but the software will also have its great value for what Google Assistant will mean and the possibility that we are present before Andromeda, her Hybrid Android / Chrome OS.
We now know that your Android / Chrome OS hybrid operating system has been internally called "Andromeda" And it is being tested on a Nexus 9 device. Yes, that tablet that passed without much attention and was developed by HTC 2 years ago. It is this time that there is clear evidence that Andromeda could make its appearance on October 4.
Google would be testing its imminent hybrid OS on a Nexus 9 made by HTC. The evidence comes from what has been found in the AOSP of Android 7.0 Nougat. The first was the file "SurfaceCompositionTest.jave", which stands for a series of low-level tests to measure graphics performance. This test does direct reference to Andromeda on numerous occasions, including that Andromeda requires a higher performance score.
According to this tool, the minimum score needed to run Andromeda is 8.0. By comparison, Android only requires 4.0 and a Nexus 9 has been able to score close to 8.8.
Now the mystery is in the reason why Google would be testing its hybrid Android / Chrome OS on that tablet. From what is known, Andromeda is focused on getting a better Android designed for devices like they would be portable, like those 2 in 1 and maybe even tablets. Another note that has been found in the AOSP refers to the free window management feature that appeared throughout the year in Android Nougat.
It is «SurfaceCompositionMeasuringActivity.java» which mentions that it detects Android devices for having the characteristic of window free management. From what it seems, everything is focused on another step on Android.