To make collaboration accessible to visually impaired users, information about nearby collaborators is now announced. For example, if a collaborator initiates a selection in a region overlapping the region where another user is editing, this would be verbalized to the collaborator.

Release track:
Rapid release and Scheduled release

 

For more information:

https://support.google.com/docs/topic/6039805?hl=en&ref_topic=1382883