Today, we launched a new look and feel for Site Explorer that provides a more dynamic interface to accommodate future feature roll-outs. The new interface also includes a new Site Summary page to provide statistics for authenticated sites. On top of this, we're also increasing the number of rules for Dynamic URL Rewriting that you can enter from 3 to 10.
The new site is located at a special URL to give you some time to play around with it and update your tools that use our interface. We will make this the default experience soon,