Google has released a new little online puzzle that offers what is probably an insight on the Pixel 4a's long-awaited launch date. It is expected to do so with a 5G variant for the first time in this series' history. However, it seems it will not make it to this event, and will instead wait until Android 11 is here too.
https://www.notebookcheck.net/The-Pixel-5a-will-launch-with-Android-11-as-will-the-4a-5G-new-leak.483866.0.html