That was fast! Right after The Sun published its photo, the Daily Mail has another one (you have to scroll down a ways).
The accompanying article says that Winstone was doing a scene with David Suchet, which, if they've got their facts straight, means we'll see a scene with Magwitch and Jaggers. Interesting tidings indeed, since, as far as I can remember, there weren't any in the book -- unless you count Magwitch's final trial. And considering that Winstone is covered in mud here, I don't think they're shooting in a courtroom. A flashback, perhaps?