Baz Luhrmann testing the Gatsby waters?

One of the few possible projects that has me really excited is Baz Luhrmann's The Great Gatsby, which has been talked about and discussed for a couple of years now but sprung back to the forefront just recently when it was rumored that Leonardo Dicaprio, Tobey Maguire, Amanda Seyfried, and Natalie Portman could all be involved. While nothing was set in stone, recent information could indicate that things are moving along more assuredly than previously thought.

The Wrap reports Maguire and Dicaprio have been workshopping scenes from the F. Scott Fitzgerald classic with Luhrmann. Maguire has been reading for the part of Nick Carraway, Dicaprio as the mysteriously rich Gatsby, and Rebecca Hall(Please Give) as Daisy Buchanan, Gatsby's love interest. Does this mean that Amanda Seyfried is out? I doubt Hall is being used as a placeholder. She's too good of an actress for that.

This doesn't exactly make it a done deal that Gatsby will be Luhrmann's next project, but it certainly would seem to be so. Honestly I'd rather have Seyfried in the lead role moreso than Hall, just because I think she could portray Daisy's shallowness far better. Daisy is a cheerful but vapid character, something which I've yet to see Hall play. She seems better suited to intellectual, self aware types.