Just a guess. Might be some finishing touches that needs to be done, and testing everything to make sure everything is perfect. I spent an hour, hour and a half simply zeroing the see-through scope for my M1903. So I know even the small things can take time.
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Edit: Ignore this post. Downloading now!
http://fallout.wikia.com/wiki/File:Fallout_Hype_Train.jpg