Android users should also keep in mind the fact that their smartphone's memory will be wiped.
At this stage it is possible to run the developer version on the Nexus 5X, 6P, Nexus Players, Pixel C and the two Pixel phones Google released a year ago.
Google is bringing a native Picture in Picture mode with Android O which will allow users to watch videos in the foreground of another app. This new feature would allow users to open two apps at the same time, a feature which Samsung and LG have had for years.
Google added that it will also begin sharing its data on update speed for its own devices with carriers and phone makers as it provides more visibility. However, it is also possible that Google pulls the plug on this option once the final build comes out.
Android O has introduced better keyboard support for better navigation between applications.
The Wi-Fi Aware APIs are available to apps which target Android O, and let apps perform operations such as discovering other devices and creating a network connection. Google compares these apps to password managers; it sounds like it'll be an improved way to manage all the info you get exhausted of having to enter over and over again. This latest Pixel launcher is installed as a system app which has been optimized for tablets.
For now, Android O can only be installed on Nexus and Pixel devices, but further down the line this will change.
This early preview of Android O is available for free, but it's aimed squarely at developers (the software must be manually downloaded and flashed to your device).
"The Google search box is great when you're looking for a specific answer, but there are also moments when you just want to catch up on the latest for topics of interest", wrote Tamar Yehoshua, VP of product management at Google, in a blog post.
Another new feature which will make phones' display even better.
Wide-gamut colour for apps: Imaging and photo editing apps can now be tweaked to take advantage of devices that support wide colour gamut displays.
With notification channels, it appears Google is taking some things it learned with bundled email and applying it to Android O. The new feature will introduce "app-defined categories for notification content", giving users the ability to block or change the behavior of a channel individually.