A set of PS3 Trophies (via Eurogamer) surfaced over the weekend, for a pack called "Stasis Interrupted." The ten trophies certainly sound like a single-player experience, referencing story beats and doling out rewards for tasks like collecting audio logs.
"In our case especially, we are not launching any new full products for the current gen again. So we've launched the last of our current gen products and everything we've got in development is for next gen. We have some things that we are supporting for current gen, like there will be DLC for both of our most recent games for the current gen that are still to come."
While that quote doesn't name-drop Colonial Marines, it is one of the studio's two most recent games. The other is Borderlands 2, and Gearbox has hinted that it might do more DLC after the Season Pass finished out with Tiny Tina's Assault on Dragon Keep.
Aliens: Colonial Marines was roundly panned upon release, including in our own review, and purported leaks claim it was the product of competing interests from various companies. It was even hit with a lawsuit for false representations of the final product.
Shacknews has contacted Sega and Gearbox regarding the Aliens DLC, and will update as more information becomes available.