It’s well known that Grant Morrison loved Christopher Nolan’s Dark Knight trilogy, and this final arc seems heavily influenced by the films. It’s a huge knock-down drag-out, in which Talia destroys Wayne Tower (in a very thinly veiled 9-11 reference), and (somehow) figures out where the Batcave is and shows up for a final showdown—to occur in #13.
Set aside the fact that #11 is pure filler and has absolutely no bearing whatsoever on the main story. No, scratch that. Don’t. The deadline problems that have plagued this title have indeed made it difficult to keep up the pace, particularly because these final issues all take place on the same night.