Here's an interesting bit of news from comicbookmovie.com. It appears that whereisbrucewayne.com has been purchased as an promotional site like I Believe in Harvey Dent was for The Dark Knight. Comic Book Movie also published this possible plot point to be associated with the promotional site:
Bruce Wayne buries himself in work as Batman and leaves his Bruce Wayne persona behind as their is nothing left for him. He hasn't been seen for 6 months in public and is said to be locked away in the newly built Wayne Manor.
Now, I can definitely get behind this Batman plot. This reeks of classic, moody, brooding Batman and I love it. This is also a perfect character progression coming from TDK. Kudos if this is true.