As we get closed and closer to the release of "The Dark Knight Rises", the general public is being inundated with a non stop barrage of marketing and advertising. If you want to stay completely in the dark and 100% spoiler-free, you pretty much have to lock yourself in your very own bat cave for the next week and a half.
Recently, a 13 minute featurette produced by Christopher Nolan himself was released to the internet and, while it gives some insight as to the overall feel of the movie, it stays vague enough not to give away anything we haven't already seen in trailers or other articles. If you're OK with this, then by all means continue on and check out the video, but otherwise now is when you want to return to your cave of ignorant bliss.
