People can edit levels TOGETHER LIVE!

[Spelos]

I wouldn't be so quick to jump into assumptions. We have to understand that it's a simple XML structure of naming and logging changes.

While it might in a sense hint towards multi-user editor, it might as well be as simple as logging who did what. It might be a way of editing the map and seeing who did what or easily removing your changes.

Real-time (live) editing requires an infrastructure that simple might not be worth the effort.

But I don't know, you might be right... I HOPE you're right.