I think they should do a more batlike batman(with a real batlike face more scarry), mmmm Sam worthington comes to mind, a more raw down to earth Batman, a totally new suit, reintventing it like they did with Batman Begins, but this time back to the Mystical idea...not the realism, like we've seen in "Bail's Saga", we've seen how close Batman could come to a real thing , beautifully created/come to live by Nolan....No it's time to go back to the Comicbook style Batman, maybe "Frank Miller" should be the next director or Tarantino, Rodriguez...
Creating a new type of batman, but with still the comic feel to it, like we missed with Nolan.
Villains would be...
-a very poetical Joker character like ....a British actor like Steve Cougan, or others like Doug Jones, or Steve Buscemi as a very Psycotic, mean, serious Joker
other villains I would like to see come to life, The Mad Hatter, Penguin, maybe King Tut or even the bookworm, Manbat, Clayface or The riddler (a better one than Carrey, he overdid his version way to much)
To put in other words, a very dark Batman but with still the old Bob Kane feel to it.....or maybe some Alan Moore ideas.