No Ra's al Ghul in Dark Knight Rises

Even though director Christopher Nolan has set his Batman films in a more or less real world setting, some fans have still speculated that Liam Neeson's Ra's al Ghul character -- last seen taking a dive onboard a plummeting train -- might return to the series. What do you think was his answer?
We spoke to Neeson this past weekend and asked him if he will play Ra's again at some point. The character, after all, is virtually immortal in the comics.