Got an email after asking Universal a question:
I was curious about whether or not I could find a trailer release date for Serenity. I'd also be interested in knowing if there was a teaser trailer, and when that was scheduled as well.
I have that the final trailer will be released with the movie "Elektra" on January 14th. I would think that the trailer would be available online shortly thereafter. I do not have any information about a teaser trailer. sorry.