User blog comment:Ygrain/Leviathan: Do you know what you are doing, Bioware?/@comment-4237253-20120915082834/@comment-1958269-20120915175737

The Leviathan dialogue was, in all likelihood, recorded at the same time as the Extended Cut dialogue. Lance Henriksen, Tricia Helfer, and Raphael Sbarge all told fans that they were recording new ME lines at some point prior to the release of Extended Cut, and Billy Bukell's interview on the BioWare blog states that development of Leviathan was initiated a few weeks after the Launch of ME3.