After reading a review of the Ubuntu Developer Summit which said that one of the proposed changes in 12.10 would be to use LightDM as the lock screen:
LightDM will be implemented as the lock-screen, thus adding visual and behavioural consistency to the desktop. Source
I was wondering what is the package name of the current lock-screen, or is it a part of the unity package?
As clarification it is this screen I am referring to: