Here's a further Star Trek Online Force Missions trailer, this one is from the Khitomer Accord five-man raid episode.

Special Task Force Missions
If you're looking for a challenge, look no further than our upcoming "Special Task Force" Missions - Raid Episodes, which combine bold storytelling with our toughest five-man missions yet.

STF: Khitomer Accord
Finally, the mysteries of the Borg attack on Vega Colony are revealed! Why did the Borg attack there, and how was an unprepared Starfleet able to defeat them?
• Confront the Borg before they can use temporal anomalies to change the past of the Federation.
• Warp back into your own past, in the hours before the attack on Vega Colony.
• Discover a base where thousands of Borg drones are being held in stasis. What are the Borg's plans for this hidden army?
• Starfleet's not ready for the Borg. A defeat here could mean that the entire Alpha Quadrant falls. Balance the scales and fight the Borg for the preservation of the quadrant.
• Learn the fate of a missing Romulan empress.