So, I browsed through S&S' website and found this:
Star Trek: The Original Series: The Continuing Missions, Volume I
collecting The Rings of Time, That Which Divides, DTI: Forgotten History; Available on or around January 29, 2013
Star Trek: Typhon Pact: The Khitomer Accords Saga
collecting Plagues of Night, Raise the Dawn, and Brinkmanship; Available on or around January 22, 2013
Star Trek: Destiny: The Complete Saga
collecting Gods of Night, Mere Mortals, and Lost Souls
Beside the fact that I don't know how legit those are (no cover image a month before the release), the only one where it would really make sense to get it as an ominibi is the Destiny one since there you'll have a decent price advantage, but with the others you safe only one dollar or so in contrast to buying the single eBooks.