TheGamersThought.com has reported that Universal Studios will no longer support HD DVD exclusively as per EGM's March 2008 issue. Picture of the story covered in EGM's magazine has been scanned by TheGamersThought.com
Original Story: http://www.thegamersthought.com/2008/02/breaking-news-egm-confirms-universals.html
This topic will not be considered rumor being that the image scanned provides proof of what was said on EGM's (a notable Ziff Davis publication) most recent magazine. The post has yet to be denied or approved by Universal and will remain the way it is until Universal states otherwise.
The writer of the post, Yaris Gutierrez, has noted to me that a Universal PR has stated to him that "Universal is not commenting on any such rumors or speculation" bringing forward much more controversial thoughts/conclusions.