Prior to the news of Apple pushing out a new update for the OS X Lion Developer Preview 4, we got our hands on some screenshots of the new Login screen as well as a video uploaded by Fmorbec. The new login screen seems to have a dark background with some shiny area, having the Apple logo in the center and Shutdown, Restart and Sleep links at the bottom.
The healthy point is that you can even modify the configuration to make your login screen ask for your username and password. This can be seen here
Adding to these features, we also saw a display of Clock, a Wifi Menu, the computer name and the IP Address too. The circling around through these informations is achieved by clicking on the clock.