The Dark Knight Rises is currently in production in London, working towards a release date scheduled for July 20, 2012. As is the case with most Christopher Nolan Batman movies, the plot is being kept under tight wraps, but it seems one intriguing tidbit has been leaked. Be warned, though, there may be severe plot spoilers for The Dark Knight Rises, so read on at your own risk.

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On Monday, actor Liam Neeson was spotted on the London set shooting a scene as his Batman Begins character, Ra's Al Ghul. It isn't known if the scene in question is a flashback, or if it is set in the present day and he is somehow resurrected, possibly by the Lazarus Pits. Back in May, we showed you some cryptic shots from the Jodhpur, India set, which are believed to be the Lazarus Pits.

Related: Casting The Batman: How Robert Pattinson Won the Role of Bruce Wayne

Josh Pence is playing a younger version of Ra's Al Ghul in The Dark Knight Rises, although it is not known how this younger character, or Liam Neeson's version will fit into the story. Liam Neeson filmed his part on Monday, and was spotted in New York City on Tuesday for the premiere of Spider-Man: Turn Off the Dark on Broadway. It isn't know if Liam Neeson will return for more filming.

We do know that Christopher Nolan is directing The Dark Knight Rises from a screenplay by David S. Goyer. Aside from the confirmed cast members, we don't know much more than that, but we'll continue to keep you posted with any and all The Dark Knight Rises news as soon as it happens.