Last we heard from Neeson regarding the rumors of his return for Chris Nolan's final Bat movie were that it was definitely not on going to happen(read about that HERE). IGN reported the info second hand with no actual quotes from the actor. But it certainly sounded as if he had no wish to return, as they suggested he wasn't even fussed with the movie he did appear in(Batman Begins). Well now we hear what he has to say in a recent interview first hand, with a little addition that he would be open to returning if he was asked..
“That rumour is totally not true. In the comic books, Ra’s Al Ghul goes into a life bath of some sort and immerses himself to become immortal; So that’s probably where that comes from.
“But no-one’s approached me with an offer. I’d like to if it happens.”
With the recent (possible) leaked plot details pointing to Rhas Al Ghul's daughter Talia being involved in the movie, would a small part for Neeson be something fans wanted to see? Either way, despite his expressed desire to come back it's doubtful there will be any turn around from Nolan regarding the script at this late stage. Still, you never know I guess.