38:30 - 40:00 is quite a good section of that video; he talks a tidbit about the xeno soldier and lurker and you also learn that you can actually have 2 crushers fielded at once, which also suggests that the marines can have 2 smartguns fielded at once. In addition we learn that, for the campaign, the xeno spawn-points are changed depending on whether the player is playing co-op or solo.
Also, skip right to the end to see quite a good firefight (if you could call it that, it's more just the GBX xenos co-ordinating an ambush on the packed-together marine team) but it did remind me a lot of the second fight scene in the aliens movie, but with more action and beheadings - which brings me to my next compliment, I am quite surprised (in a good way) that they implemented beheadings and complete limb removal into the combat, which makes it quite a bit gorier (possibly even encorporating a more serious element, although the spitter possibly cancels that out lol) than the movies IMO.