If I remember correctly they said something along the lines of - they planned on adding it as the new tank job in 3.0 but they didn't want to release to eastern inspired jobs (because of Ninja) back to back, so they switched it out and brought in Dark Knight and made it the new tank instead.

They then (I believe) said they would like to see it come out at some point, but had no established date for when they would because it would have to fit along with the story/expansion/whatever... So at the moment your answer would be: We don't know lol