What will "Group Sharing" allow?

What will "Group Sharing" allow?

I did a search of the forms and found quite a few ideas around the sharing module. I'm just looking for a concise description of the "Group Sharing" feature being worked on (ref http://help.creator.zoho.com/Working-on.html) thanks.

PS: It might be a good idea to link each "being worked on" feature to a page describing the feature, links to forum posts, and maybe subscription levels etc....beyond the terse listings in the roadmap. This page could become part of the wiki when the feature is released.