I recently purchased the latest DLC and I started completing the Achievements still left in my to do list.
It looks like there is a crossover with Star Control Origins. There are four new achievements: win as Mu'Kay, win as Mowlings, win as Free Trandals and win as Tywom. These appear to be SCO civilizations (I do not own SCO). It doesn't look like those races are available to play just yet. That or I just don't know how to DL them.
Very cool if true!