NIN just posted the following picture on Instagram and elsewhere
Some were quick to notice a similarity to artworks for a previous song and suggested that a new release was on its way. I think it's unlikely. The town (Chicago) and the date suggest an upcoming show. Since NIN seem to be very much into festivals these days I did some searching and found this event called Riot Fest. Let's wait and see if I am right in believing NIN will be there. :)
Update: The band confirmed they will be at Riot Fest. Other performers include Queens of the Stone Age, M.I.A., New Order and Paramore.