Michelle Monaghan is set to play Robert Downey Jr.'s preggers wife in 'Due Date,' Matt Damon and Clint Eastwood are teaming up for the supernatural thriller 'Hereafter,' 'Tron Legacy' sets an IMAX 3-D release date, and more of today's top movie headlines. Michelle Monaghan is 'Due' for a comedy worthy of her talents, and it looks like she may have found one. The 'Made of Honor' star will play Robert Downey Jr.'s baby mama in 'Due Date.' Directed by 'Hangover' helmer Todd Phillips, the film follows Downey's dad-to-be as he and a mismatched traveling companion (Zach Galifianakis) race across the country to get home before his wife delivers the baby. [Variety]

Matt Damon and Clint Eastwood just finished collaborating on the real-life South African drama 'Invictus,' and now they're reteaming for a new film with a supernatural slant. Damon will star and Eastwood will direct 'Hereafter,' a top-secret 'Sixth Sense'-esque thriller written by 'The Queen' scribe Peter Morgan. [The Hollywood Reporter] | [Variety]

Get ready to get your 'Tron' on as you never have before. 'Tron Legacy' -- which stars Jeff Bridges, Garrett Hedlund and Olivia Wilde and is being billed as both a sequel to and reboot of the groundbreaking 1982 video game-esque film -- will be released in glorious IMAX 3-D on Dec. 17, 2010, the same day it enjoys a wide theatrical release in conventional theaters. [The Hollywood Reporter]

The Weinstein Co. has bumped back the release of the Michael Cera comedy 'Youth in Revolt' yet again, this time from Oct. 30 to Jan. 15, 2010. The move is somewhat surprising, coming hot on the heels of the film's very well-received debut at the Toronto International Film Festival. 'Revolt' had initially been slated to open this summer. [Variety]

Paul Giamatti has been crowned king ... King John, that is. He'll play the tyrannical ruler in 'Ironclad,' a medieval action flick in which the Knights Templar defend Rochester castle from the invading king in 13th century England. [Variety]

Rebecca Hall will star opposite Kat Dennings in 'Liars (A-E),' a Richard Linklater-directed dramedy about two girls who set out on a road trip during the Obama inauguration to reclaim items from Hall's ex-boyfriend. [The Hollywood Reporter]