http://www.xbox360achievements.org/news/news-12084-Saints-Row--The-Third-Expansion-Enter-the-Dominatrix-Cancelled--Folded-into-Saints-Row-4.html

Apparantly it's going to be part of Saints Row 4, not sure of the reasoning behind it though.

(Admin's edit)

• Original Press release

Saints Row: The Third – Enter the Dominatrix Now Part of Something Bigger Than Itself
Cumulative Awesomeness of Gameplay Experience Can No Longer Fit into Expansion Pack; Enter The Dominatrix Will Be Incorporated into the Next Great Sequel in the Saints Row Franchise

THQ Inc. and Volition, Inc. today announced development of the standalone expansion Saints Row: The Third – Enter the Dominatrix will now be incorporated into production of the next great sequel in the Saints R…

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