The Aliens and PRedator skins for Multiplayer have been leaked, ranging from Grid(AvP the movie), to the exclusive preorder Alien Head Predator.

The site is in german, but the text basically describes each skin. The marine skins have not been shown as of yet.

Dragoshi1 via avp2.onlinewelten.com »

"...The first level we were shown was bereft of xenomorphs but did feature claustrophobic hallways and a lot of acid burns through floor and ceiling grates. It resembled the colony on LV-426 from Aliens in art design had was very richly detailed. A big focus was placed on telling us about their in-house Asura game engine and its ability to render real-time shadows. A marine throwing a flare behind a stairwell have way to a beautiful array of light and shadow. Even the marine character's flashl..."

JelalTrueshot via www.gamingshogun.com »

"Currently in development at Rebellion, the team behind Rogue Trooper and Free Running for the PlayStation2 and other assorted systems, Aliens Vs Predator allows the player to take on the form of an Alien, Predator or Marine in a fashion inspired by the critically acclaimed releases of the early ‘90s, Aliens Versus Predator and its sequel."

kevcothirtythree via www.electronictheatre.co.uk »