Rumor of the day: Heath Ledger's Joker to cameo in Batman 3

Rumor of the day: Heath Ledger's Joker to cameo in Batman 3

Heath Ledger's Joker to return in Christopher Nolan's The Dark Knight Rises? That's the rumor going around today, and while we're skeptical about it, we're also definitely intrigued.
According to ShowbizSpy, "sources" have confirmed that Christopher Nolan plans to use unseen footage from Ledger's incredible Oscar-winning performance as the deranged Joker from The Dark Knight in his upcoming third Batman film. Ledger's appearance in the movie would simply be a cameo, since the actor passed away from an accidental overdose in 2008 at the age of 28.

A "movie insider" apparently said:
"The idea is to use these fragments of cut scenes and use CGI to have The Joker appear one last time."Chris wants some continuity between movies and for the franchise to pay tribute to Heath and his portrayal of the Joker.
"It would only be a fleeting moment in the movie and would only be included with the full consent of Heath's family."
Is there any truth to this story? Possibly, but please take it with a grain (or mountain) of salt until we hear it from Nolan himself.
The Dark Knight Rises is currently in preproduction and is set to be released in theaters on July 20, 2012.