Tigole just posted an explanation of the type of content that Zul'Gurub will be. You can read about it here. (http://forums.worldofwarcraft.com/thread.aspx?fn=wow-dungeons&t=98600&p=#post98600)

He also announced an upcoming maintenance patch (http://forums.worldofwarcraft.com/thread.aspx?fn=wow-dungeons&t=98586&p=#post98586) for some BWL issues.