In a press release yesterday, Warner Brothers announced that their movies will be exclusively on Blu-Ray high definition discs starting in May 2008. Currently, all five Potter films are available in HD-DVD and Blu-Ray formats. All of WB's movies will continue to be released on standard DVD.
Because of WB's announcement, Sony's Blu-Ray format is dominating the high-definition market. Most major movie studios are now exclusive to it, and the competing HD-DVD format is likely to disappear soon.