I really only need two major changes.
I felt the only part where Batman felt like a detective in Nolan's Universe was in the first half of The Dark Knight, where he tries to catch the Joker. In Batman Begins, he becomes an icon, a shadowy figure, but he doesn't need to figure out anything, really. He's handed the information by screaming in people's faces. Nothing like shooting bullets in bricks to see how they fragment in order to reconstruct finger prints. And as for The Dark Knight Rises...well, there he was just an icon, not a detective. For the next version of Batman, we need the detective, a clever hero who can match wits with intelligent criminals. For me, the battle of wits between the Joker and Batman was the highlight of the trilogy.
And...the Bat Family. We need it. We've spent the last three films exploring Batman as a loner. One of my favorite parts of TDKR was Batman's relationship with Catwoman, and, throughout the trilogy, I loved his chemistry with Gordon. We need more of THAT. We need Robin, Nightwing, Oracle, Batgirl, etc. We need to see another side of the character that really has only been explored decently in Batman Forever (Robin was one of the few things that kept that film from being just mediocre). We need a greater Batman universe. And, of course, if the characters become successes in their own right, maybe spin-offs?
The rest is just superficial to me. Of course we're getting a less grounded Batman next with Superman and Justice League coming in the future. The Batman voice never really bothered me, but I always felt Keaton nailed Batman's presence in the 89 film. Batman to me isn't about the fight scenes so much as the psychology and characters, but better fights would be cool too. Still, if the previous two things are included in the new Batman series, I'd be fine with that.