The company already talked a lot about what's coming in this version, which had been known as "Android O" until now as it has progressed through beta testing. One of the biggest changes that has already been discussed is picture-in-picture mode, which will allow users to view movies while doing other tasks, an option already available on Samsung devices.
Google typically names its Android releases after desserts (Android N became Android Nougat, for example). The final name is expected on Monday as well.
The company will likely first release the next version of Android to its Pixel smartphones. It typically takes months or a year or more for smartphone makers to roll out Android updates to smartphones, so don't expect to see it on your phone right away.