According to a user at the Bioware forums, the PS3 patch added 3 trophies for a new DLC add-on called "Arrival". Others have said that this isn't a hoax. Here's the trophy descriptions:
The Ultimate Sacrifice
- Complete the Arrival DLC
-Survive all five waves in the battle for Object Rho
-Rescue Dr. Amanda Kenson without attracting hostile attention.
Based on the title of the DLC, I'm guessing that this takes place after the suicide mission.