Natalie Portman is producing the film for the adaptation of the novel by Seth Grahame-Smith. She was originally set to play Elizabeth Bennett but is still on board as producer. Scarlet Johannson, Tilda Swinton, Mia Wasikowska, Catherine O'Hara and now Anne Hathaway have been mentioned as possibilities for the the zombie-slaying Lizzie. Bradley Cooper and recently James McAvoy have been rumored for Darcy's role. The original director has dropped out and a new one is on board. [source: Digital Spy]
Wouldn't it be weird if it did end up being McAvoy & Hathaway after their pairing in Becoming Jane?
(I'm posting this for those interested however I'll be happy if it never materializes)