In the image above, you see an older picture of bane, but if you look closely at the street pole, at the bottom, there are words spray painted in green, it reads "Risk It."
Now have been given the fact that Joseph Gordon Levitt has been seen on set, spray painting on walls, it is highly likely that this is one of the image/phrase he has put around Gotham.
There has been some speculation that John Blake's (Joseph Gordon Levitt) doing this for Jim Gordon, in order to maintain structure in Gotham. But this doesn't seem as though it is something he would put up for Gordon.
Now this is Just speculation, but I believe that this supports the idea of Gordon being a secret villain such as Riddler.