Cryptic have announced the details of their weekly Star Trek Online episodes, which star this week end with the first episode in Series 1: The Breen, which is described as follows: "Beginning in late August, Series 1 introduces a fan favorite: The Breen. A longtime enemy of the Klingon Empire, the Breen have grown even more aggressive and have taken particular interest in the planet Defera. It's up to you and your crew to determine what's brought the Breen to Defera and to save the Deferi people."
The three episodes are:
#1: Cold Call
Starfleet and the Klingon Empire both respond to call for aid after the Breen attack the planet Defera.
#2: Out in the Cold
While searching for a lost ship, the crew uncovers a plot to enslave the Deferi people.
#3: Cold Comfort
Breen slavers leave a ship and its crew crippled while they hunt for buried memories among the Deferi.
Here's one picture that accompanied the release, you can see more, and release dates, on the original report: