The user account wallpaper transition feature has landed in Ubuntu 12.04 default login screen.
The effect shows the desktop wallpaper of each user as accounts are scrolled through.
Although the current implementation is not quite as blingy as the prototype shown off before xmas it does improve the character and personalisation of an otherwise perfunctory prompt screen.
Just don’t set anything you wouldn’t want your parents/other-half to see as your wallpaper!
Other features recently landed in the Unity Greeter include a keyboard indicator for switching language layouts; an updated ‘Ubuntu 12.04 logo’; system-default password masking (below), and ‘end stops’ to user list scrolling.