IGN has just released the first short preview of the marine campaign as demoed at E3:
“The scenario we’re witness to comes from the latter half of the game, with the Marines barricaded in one of the colonies and recuperating from a vicious alien assault. Sentry guns protect the perimeter, with the player activating them remotely from various laptops. It’s a scene that’s strongly reminiscent of one late on in the Aliens film, pulled from the original theatrical release but restored for the Special Editions, in which the Marines use sentries against hordes of aliens.”
Unfortunately there is no gameplay footage or screenshots and the details aren’t in any vast quantity for but it’s a nice tease. Check it out. Thanks to That Yellow Alien for the news.