The Dark Knight will be the first million-disc Blu-ray release, Video Business reported on its website Friday, noting that just last year -- in March2007 -- Sony set a record when it shipped 100,000 Blu-ray copies of Casino Royale. Many of the Dark Knight discs, the tradepublication said, will be bundled with hardware, including Blu-ray playersand game devices. "If a household is on the fence about making a Blu-rayplayer or PS3 purchase, this title can be influential in making thathappen," Warner Home Video's Dorinda Marticorena told Video Business. The Los Angeles Times reported on Friday that several major studiosand consumer electronics firms plan to spend $25 million during the holidayseason as part of their "Tru Blu" campaign to promote Blu-ray releases.