The proposed PaPaZ film will be produced by Portman's own production house handsomecharlie in conjunction with Richard Kelly's Darko Films. And with Lionsgate stepping in to not only distribute the film, but fully finance it as well, chances are pretty good this will see the light of day sooner rather than later. No screenwriters, directors, or further cast have been announced yet, but Portman shall be topping the film as the love-lorn Elizabeth Bennet.
If the film inevitably does well, and I imagine it should do just fine given the two demographics it appeals to, one can expect the rash of alternate universe literary classics that followed in the steps of PaPaZ to be in line for adaptations as well. I haven't read the book myself, though I have heard it rather lacks in the undead department, but if a film version helps pave the way for a big screen The Adventures of Huckleberry Finn and Zombie Jim, then I say bring it on.