Here the plans for further improvements of the Active Directory Integration WordPress plugin:

WordPress MU compatibility (planned for 1.0)
tool for testing DONE 0.9.9-dev
object-orientation redesign DONE 0.9.1
code clean up DONE 0.9.1
email notification of user and/or admin when a user account is blocked DONE 0.9.1
drop table on uninstall or deactivation DONE 0.9.2
adding more languages
better user interface for role [...]

Today I have finished my work an the WordPress Plugin Active Directory Integration and published it on wordpress.org . The plugin  is based on a work of  Jonathan Marc Bearak and gives you the ability to authenticate and authorize your WordPress users against an Active Diretory. One of the major improvements is security.