Im really hoping that someone will add in a level based on the outpost defense scene in Starship Troopers.  (The following is the best image I could find of that scene, God damn copyright laws.)

I suppose a giant space ship being invaded by an alien force. I would love to see a recreation of Dead Space though :P.

I'd like to see copyright infringement on just about every damn sci-fi IP out there. Come on modders, I know you're up to the task.

I wanna see them bring over the two campaigns from the ut2k4 mod. 
As much as the new elevator scene is a nice throwback, the old one was cooler.

I suppose it is a bit cliched, but a level where you control the alien swarm and have to attack 4 humans

Me and my friends discussed this whilst getting annoyed on insane.
 
Fuck you parasites, just fuck you.
 
However, I'd like to see a tower, level 1, weak bad guys, level 2, increase the number....level 10, those shield things, and so on.
And the obvious survival mode, but with proper ammo drops and stuff, or crates to deploy ammo, I'm verging on downloading the SDK, but I've never used one before ¬¬. I've so many ideas though =(
 
Maybe even a top down left 4 dead.

I liked the idea of there being different colonies. Maybe we can get different types of colonies, like for example with a mining colony you would have hazards where rocks fall or used to your advantage to block routes from the aliens. Another colony where It's like a city district so you are on rooftops and offices and have to walk across bridges made from wooden boards that are weak, Some new alien types wouldn't hurt either, maybe one that acts similar to the spitter in L4D2 or traps you in place. Infested Humans would be cool maybe the Aliens adapt to the point where they can turn Human soldiers against the IAF marines so not only do they fend off the aliens but now possessed defense forces. Lots of Cliches I know but they aren't in the game at the moment, would be cool to see.

I'm verging on downloading the SDK, but I've never used one before ¬¬. I've so many ideas though =( Maybe even a top down left 4 dead. "

@Sacerdos87

" Infested Humans would be cool maybe the Aliens adapt to the point where they can turn Human soldiers against the IAF marines so not only do they fend off the aliens but now possessed defense forces. 

Re enactment of Aliens would be really good

I want a Starcraft 2 Marine Model, Terran Marines and replace the swarm with Zergs, that or just player-models I don't care XD

Just more campaigns that are free. Just keep the free content coming.
 
lol

Starcraft.

New campaign featuring some natural environs, maybe rocky planet + outpost defense + swarm tunnel network (a la starship troopers) and maybe a talent/perk system to give us some character customization that would probably end up breaking the balance.

" Just more campaigns that are free. Just keep the free content coming.  lol "

I'd like some X-com turn based mission functionality, or something like that.

I'm hoping for some L4D game modes, such as more than one team trying to complete a map at the same time.

More customization. Perks that will effect things like health, speed, etc.