First Showing seem inclined to treat the grid as stronger confirmation of the presence of The Riddler as a character than of Gordon-Levitt as the actor to play him, but having seen Gordon-Levitt’s charismatic performance in Inception and his unabashed praise for Christopher Nolan as a director, it would not be a surprise to see him confirmed in the role shortly.
Although Gordon-Levitt may seem a little fresh-faced for a heavyweight villain role, he is already the same age as Heath Ledger was when The Dark Knight was released and that didn’t work out so badly. Bear in mind also the ease with which he handled the action and fighting sequences in Inception and Nolan’s increasing preference for using the same actors (Bale, Caine, Cillian Murphy) across several films. File this one under hopeful expectation.