Editing document units is now networked. While editing, the most recent changes are broadcast to everyone every three seconds. So if you type very slowly, or take a lot of time to formulate a pith, others will have some feedback.
I'd like to see how often I can get this to update without it bogging down the server and other clients. I don't think it will get to near real-time (even Google Docs has a noticeable delay), but perhaps something that feels a bit more dynamic than every three seconds would be nice.