The Dark Knight Rises with more casting news: Joseph Gordon-Levitt locked and Juno Temple in talks

It looks like the rumours were true, Joseph Gordon-Levitt has signed onto the Dark Knight Rises. As we're only a few months away from principal photography, I'd expect more details to come to the fore quite soon.

Update 20th March: it appears that the rumours were even more true, with JGL's role being touted as none other than Alberto Falcone as featured in The Long Halloween and Dark Victory. I won't spoil those stories other than saying he is Carmine Falcone's son. Interesting choice, I think that I'll be reading those two collections very soon.

After much speculation, the Inception star will re-team with director Christopher Nolan again for an as yet, still unknown role.
Warner Bros is also looking for a supporting role to be filled as well with British indie starlet Juno Temple (Kaboom, Atonement). The part is said to be that of a street-smart Gotham girl. No formal offer has been presented to her as of yet though.
Unfortunately nothing too revealing to report here as Joseph Gordon-Levitt's role still has not been disclosed but Variety's Jeff Sneider adds his thoughts on what it may or may not be:
Nolan's camp is extraordinarily airtight -- but speculation has ranged from The Riddler (don't bet a plug nickel on this) to League of Shadows villain Deadshot (more likely).
The Dark Knight Rises stars Christian Bale, Tom Hardy, Anne Hathaway, Michael Caine Gary Oldman and Morgan Freeman. Nolan will direct the film from a screenplay he wrote with Jonathan Nolan, from a story by Christopher Nolan and David S. Goyer. Nolan will also produce the film with his longtime producing partner, Emma Thomas, and Charles Roven. “The Dark Knight Rises” is slated for release on July 20, 2012. The film will be distributed worldwide by Warner Bros. Pictures, a Warner Bros. Entertainment Company.

Source: DailyBlam