Date revealed by accident.
With the release of Android 11 Developers Preview, Google said that it plans to release a stable version of the system in the third quarter of this year. Now the company mistakenly revealed the exact date of the announcement.
What is known
Google posted a video (of course, the video is already removed) for the event Hey Google Smart Home Summit. On one of the slides was shown a list of tasks that must be performed by the developers until 8 September. It was the day of the planned announcement of the stable version of Android 11. By the way, last year Android 10 released on 3 September.
Recall that in Android 11 will appear a lot of small but useful changes. For example, the developers will add in the notification bar section Conversations (with eng. dialogues). It will group all the correspondence in instant messengers. Also in the firmware will be a function of Bubbles, updated food menu, panel Media Controls responsive and quick settings section with frequently used applications on the desktop, and much more.