Tinker Tailor Cast Shapes Up

More details are being revealed (or at least rumored) about who's playing who in Tomas Alfredson's new feature version of Tinker, Tailor, Soldier, Spy.  Dark Horizons points the way to a story in The Daily Mail alleging that Inception's Tom Hardy has replaced Inglourious Basterds' Michael Fassbender... and reveals the role that he'll be playing to be that of rogue "scalphunter" (Le Carré slang for agents who handle dirtier jobs, like murder or kidnapping) Ricky Tarr.  Makes sense, as Tarr's pretty much the only other young character in the cast besides Peter Guillam, who we know is being played by Benedict Cumberbatch.  Besides Gary Oldman, who's confirmed to play the unassuming spymaster George Smiley, the tabloid states that the cast will be rounded out by Ciaran Hinds (Munich), Jared Harris (Mad Men) and Colin Firth.  That's the first I've heard of Hinds or Harris being involved, but the list omits previously rumored Ralf Fiennes and David Thewlis.  Does that mean they're out? And who are the ones who are in playing? I'm dying to know. Hopefully, all will be clear soon, as the newspaper reports that filming is set to begin in just a few weeks.