The Vulture report also offers all sorts of theories* on why Ritchie may get to helm 'Xerxes' over Snyder: 1) WB is worried about getting 'Superman' into production soon for contractual reasons; 2) early test screenings on 'Sucker Punch' were allegedly unkind; 3) Snyder's last two flicks (the owl one and the naked blue superhero one) didn't perform as well as expected. But it's probably just a case of Mr. Snyder being very busy, Mr. Ritchie (aside from post-production on 'Sherlock Holmes: A Game of Shadows') being ... not as busy, and the studio wanting a profitable '300' sequel soon, goshdarnit! There's a big July release date with Xerxes' name just waiting for it!
*(No offense to Vulture, but we take test-screening smackdown reports with a grain of salt around here. For all we know, some overzealous newbie intern from Paramount / Universal / Fox could be spreading nasty rumors just to be a wise-ass.)
Update (2/17/10): A report from Entertainment Weekly: "Reports that the Sherlock Holmes director had been formally offered the job are "an erroneous rumor," according to (a WB) rep."