I have no idea, though neither does Margaret Lyons over at Vulture.com. She says that Christian Bale is definitely NOT returning to the Batcave. Whatever anyone thinks about Bale – or his temperament – the man is Batman in the same way that Robert Downey, Jr. is Iron Man.
But seeing that Downey has not signed up for another Iron Man feature – despite the fact that “Iron Man 3” earned over a billion dollars – it shouldn’t be too great a stretch that Bale is out as Batman. This fact is made clearer when you take into account that he has said in the past that, if Christopher Nolan isn’t coming back – he isn’t – then neither will he.
The interesting thing is that I suspect Downey, Jr. is more easily replaceable than Bale (in fact, I wouldn’t be surprised if Tony Stark, in future stand-alone Iron Man films, is played by Dominic Cooper, which would be very meta seeing that he played Tony Stark’s father in “Captain America) because his performance is arguably more iconic.
And he wasn’t a team player in Nolan’s Batman trilogy, which I suspect the reboot will somehow address.