About 27 minutes in the Alien box comes out but he's talking about the technical issues of IPs and etc right now.
At about 32 minutes he does start talking Aliens. 5 marines, 1 Ripley, 8 x 1 type of Alien, 8 x another. It does sound like there's going to be expansions - definitely other Ripleys, the other marines, Bishop, Burke, Newt, 3D terrain. It's specifically set within the Aliens narrative like the Leading Edge game.