UPDATE: It's been brought to my attention that Ms. Greene was never actually confirmed for the role, only rumored. While it is nonetheless likely that the actress won't be announcing much until the "Breaking Dawn" dates are set, there's really no mystery here, no replacement. Emma Roberts is in, very likely as Jill Prescott, and she's not replacing anyone.
There's been a lot of movement in the world of "Scream 4 over the past few weeks. The cast is growing, with Hayden Panettiere, Rory Culkin and Lake Bell confirmed for roles. "Twilight" star Ashley Greene was confirmed in the same report, to be playing Sidney Prescott's (Neve Campbell) niece Jill, but a new casting development suggests there's been a change.
Late yesterday, "Hotel For Dogs" star Emma Roberts was revealed as a cast member for an unconfirmed role, but one that sources identified as... Jill. Greene's character. The "Twilight" star's agent responded to MTV's inquiries with a "No comment." I speculate that if Greene has indeed abandoned the "Scream" sequel, it's because she'll soon be need on the set of another high-profile movie: "Breaking Dawn." What do you readers think?