I have a feeling we're going to see a continuation of Nolan's style, or at least someone with a similar sensibility. Nolan's Batman worked, and I can see WB trying to duplicate that as much as humanly possible- even if anything for monetary purposes.
Nolan is going to remain as a producer on the next Batman film, at least according to WB, so I can see a situation similar to Man of Steel where maybe Nolan and Goyer come up with a basic story (and Goyer possibly writes a draft of the script). Then Nolan and WB collectively find a director. I'm sure we'll see the likes of Matt Reeves (who is currently helming The Twilight Zone remake for WB), Duncan Jones, Tony Scott, and likely Darren Aronofsky (who I can see quickly becoming the frontrunner). These guys were contenders to direct Superman, so I can see them being looked at for Batman as well.
As much as I would love to see a radically different approach for the "reboot", or next installment, I don't see that happening (unless The Dark Knight Rises flops hard). Nolan's Batman films are a winning strategy for Warner Bros., and they are likely going to try and keep that going for as long as humanly possible.