Seems like another e-book can be added to the early 2014 schedule:
TOS: Shadow of the Machine
by Scott Harrison, currently scheduled on the Simon Schuster site for December 30th 2013
, so it would be a January 2014 book, I guess.
I've asked Scott Harrison on Twitter and it is indeed an eBook novella, as 8of5 speculated, the page count on the s&S site is wrong.
Scott Harrison talked about the book on his blog
including a short synopsis:
Set four days after the events of the movie Star Trek: The Motion Picture it will deal with the aftermath of the crew's encounter with V'Ger, as the Enterprise returns to drydock to finish its refit. The story will follow the characters of Kirk, Spock and Sulu as they return to their families, each haunted by their own particular personal demon.