Terrible though it likely will be, casting on The Tomb hasn’t been all that painful thus far. Arnold Schwarzenegger and Sylvester Stallone are two people I have very little interest in seeing onscreen ever again, yes, but Variety reports that Amy Ryan, Vincent D’Onofrio, and 50 Cent are now set to join the lineup, which also has Jim Caviezel and Vinnie Jones in tow. (Okay, 50 Cent isn’t such a great choice.)

Miles Chaplin‘s screenplay casts Stallone as a man trying to escape from the high-security prison he built — so, in the supporting cast, Ryan will play “Stallone’s business partner and potential love interest”; D’Onofrio is sought to play “the deputy director of the Prisons Bureau who convinces Stallone to take one last job before he retires”; and 50 Cent will probably play a moody convict. It’s also learned that Jones, who we reported on a few weeks ago, is taking the fitting role of a ruthless guard. Mikael Håfström (1408) is directing; The Tomb should hit in 2013.

Then, Deadline fills us in on Ben Stiller‘s next job behind the camera, The Secret Life of Walter Mitty. It’s difficult to figure out how big these parts will be — the descriptions aren’t what we’d call “extensive” — but it’s said that Kathryn Hahn (Step Brothers, Wanderlust) and Josh Charles (The Good Wife) are both joining; the former is playing Odessa, the sister to Stiller‘s titular lead, while the latter has been cast as Phil Melhoff, ex-husband of Kristen Wiig‘s character, Cheryl.

Shirley MacLaine, Adam Scott, and Patton Oswalt are also starring. Shooting should commence in the near future.

Does either film look any better with this latest casting?