Kudos to the guys that pointed out the blatant Photoshopping, as I wouldn't have clicked on the thumbnail had I not read about it. (Already saw a small shot of this in a print mag)
There are two cuts to the image, either fully inserting the marines into the picture from a screenshot taken from virtually the same position or trying to re-take pictures of marines to copy over this one and obscure the true background. My money's on the first.
Where are the cuts? Two overlaid images were inserted and you can see the most blatant evidence of this in the "T" that's formed between the two marines and joining above their heads, meaning this shot is a composite of 3 pieces (and they possibly had to position each character just to make the scene). Look at the dark-to-light edge between them and follow it up to the corner of the door. I work in Photoshop a lot and, TBH, I'm surprised that they would let something like this out as one of their first press images. Some of us here could honestly do a better job hiding it.
All I was originally gonna say, though, is that I hope Raven doesn't screw up Quake. I love their games but usually burn through them real quick and don't find any fun in the MP. If this is anything like the other Quakes (especially Quake 1), they'll have me hooked. But to see them having to piece together scenes like this just to get their first combat screenshot out makes me think they might still be earlier in development than we would hope...