We figured that Naughty Dog would tire of its propensity to tease us once Uncharted 2: Among Thieves had finally hit store shelves. However, if the developer's recent late-night tweet is any indication, its still got a few surprises up its sleeve. The aforementioned tweet simply read, "working late tonight, got a ton of things that need to get done," and included a link to the unsettling image above.
If we were to wager a guess as to what those ... things are, our early analysis would be Helghast skeletons. Now, with Halloween coming up, the skeletons thing makes sense. Helghast, though? That's just garishly non-canonical.