Toonami Infolink - The name's Rumor, Batman Rumor.

According to Batman On Film, the name most often being bandied about for the upcoming BATMAN 5 role of Ra's Al Ghul is Daniel Day-Lewis, most recently of GANGS OF NEW YORK.

So that puts Christian Bale as Batman, Michael Caine as Alfred, and Daniel Day-Lewis as Ra's Al Ghul with a little Scarecrow thrown in for good measure. Sounds like it could be interesting.