Now that editor Margaret Clark has broken the news on TrekMovie.com, I can post it here:

One of my upcoming projects will be an expansion of my 2007 Star Trek: Mirror Universe short novel, The Sorrows of Empire. The original told the story of Spock’s 29-year rise and fall from power, and not only how but why he transformed the Terran Empire into the Terran Republic.

The original version of the story, published as part of the trade-paperback anthology Star Trek: Mirror Universe, Vol. 1: Glass Empires, was approximately 46,000 words long. My new commission for this project is to add another 40,000-50,000 words to the story, expanding its scope to reveal more characters’ points of view, more of the historical sweep of the 23rd century, and more of Spock’s grand plan.

The expanded edition of The Sorrows of Empire will be published in February 2010 as a mass-market paperback.