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Not sure if this has been posted yet, but according to this, we can expect the second pack to have a February release: http://www.xbox360achievements.org/news/news-7405-More-Xbox-Live-Content-For-The-End-of-January-and-Beginning-of-February.html
I cannot say how good or reliable source this is. Who do you think will be or hope will be a part of this costume pack should it be accurate?