Looks like it might happen, according to Jeremy Renner. In a NY Times profile the actor announced that he will star in James McTeigue's The Raven, with Ewan McGregor in talks to co-star:
The project, announced late last summer, is "a fictional account of Edgar Allan Poe's final five days as the joins a hunt for a serial killer inspired by his stories." McTeigue told /Film, "It's like the poem, 'The Raven', itself, crossed with 'Se7en'. It should be pretty cool. The script is really good and everyone responds to it really well. I'm in the middle of casting." We're guessing that McGregor is being eyed for the role of Poe, with Renner playing a sidekick of some kind. [The Playlist]
While we're on the subject of Ewan McGregor, you can read a new review of upcoming film, The Ghost Writer over at Rolling Stone.