Just noticed something on the new nin.com.

The similarities between the covers of Still and the new record have been noted. Under Still's listing on the new site the text mentions that Still is one of "Reznor's favorite records of his own" and specifically mentions that the blueprints for future NIN records lie within. Given Trent's focus on that era recently, his love for Still, and the similarity with the cover of the new record...I'd say all of this could be a fairly large clue as to what we may be in for.

An "unexpected left turn" from the style of Hesitation Marks could very well be in the vein of Still.