Both HD DVD and Blu-ray editions will most likely be in 1080p High Definition with Dolby Digital 5.1 tracks recorded at 640 kilobytes per second and feature the Theatrical Trailer seen on the DVD edition.

Quote: Originally posted by Sehnzeleid on 15 March 2007
"BLU RAY has a superior picture with up 50Gb of image information stored on one disc. Maxed out on HD DVD you only get 20Gb."
ABSOLUTELY untrue. Blu-ray is indeed 50GB (dual layer) and 25 GB (single layer), but this does NOT mean the format delivers a superior picture. HD DVD is 30 GB (dual layer)(not 20) and 15 GB (single layer). The care and method of video encoding used makes ALL the difference in terms of image quality. On a far more consistent basis the image quality on HD DVD has been superior to that of Blu-ray (even with 50 GB discs). I own both and I'm more satisfied with HD DVD. HD DVD players are cheaper too, and overall are better performers.
Don't believe Sony's hype marketing of Blu-ray.
Warner, being format neutral, will release this on both formats (as stated above) and there's a 99.9% chance the HD DVD and Blu-ray editions will be 100% identical in terms of video and audio quality with the same extras.