You probably best remember the Australian-born Browning as the young Angelina Jolie lookalike in A Series of Unfortunate Events -- and if you're a guy, you've probably been counting the days for her to grow up, which she did in this year's The Uninvited.
I haven't seen enough of Browning to say if she's a better lead than Seyfried or not. She's definitely dabbled more in the Gothic than Seyfried, who was an appealing pick precisely because she hadn't played dark and violent yet. She's the kind of girl who shouldn't land in a mental institution, whereas Browning (and I'm going purely off Unfortunate Events) looks as though she might expect it.
Shooting is still set to begin in the fall, and EW is still reporting that Evan Rachel Wood, Vanessa Hudgens, Abbie Cornish, and Emma Stone remain "in talks," so we could still see some faces come and go. Schedule conflicts are really killing off the cool casting this year.