Why?
Workspaces is one our of biggest development projects. It affects Tiki in many places. Workspaces are essential for Social Networking.

It spans over two week-ends. We expect that many people may only be able to come on one week-end (which is fine!)

Please see:
http://tikiwiki.org/Tikifest+Workspaces+and+Social+Networking
http://dev.tikiwiki.org/Workspace+Roadmap