I've been following the game's development for years, and have always dreamt of how cool the DLCs could be. Since they were recreating Hadley's Hope, I would have loved to be able to play through the actual movie's sequences; such as being one of the marines in the first hive sequence, or playing as Ripley as she drives the APC through to save them or driving the Power Loader against the queen, or doing the whole last stand when Hudson is taken, or even playing as Bishop and you get to pilot the dropship to rescue Ripley....and since a few of the characters for into the game are now playable, it was almost possible...
...if the game wasn't so bad. I think my expectation got the better of me..there aren't even any vehicle sections. The AI is so horrible that any last stand against the Xenos would just be a bore. And I pretty much doubt, now, that any DLC would be move-themed levels.
So yeah, my ultimate DLC would be to literally play through the Aliens movie, or at least the very iconic scenes. No way will that happen..sigh.