The Nolan movies work as a standalone Batman story that has a beginning, middle, and clearly defined end. They're great, but I don't think they work as part of a cinematic universe.
It'd take a pretty big leap to suddenly say that Superman exists in Batman's world due to the fact these films attempt to put Batman in a more realistic world, and to bring do BvS in the TDK universe would require one of two things. Using John Blakeman, a Batman no one would want to see, or completely reneging on the closure and character arcs of the trilogy by having Bruce return to Gotham.