DVD is red laser so likely EVD will not have much more capacity than DVD.

Try doing some research before posting an article next time:
http://en.wikipedia.org/wiki/HD_DVD

“The HD DVD disc is designed to be the successor to the DVD format and can store roughly 3-4 times the amount of data as its predecessor. This was achieved by using a 405 nm blue-violet laser which allows more information to be stored digitally in the same amount of physical space. The additional capacity of HD DVD means the discs are more suited to high-definition video than standard DVDs. In comparison to its main competitor, Blu-ray Disc, which also uses a blue laser, HD DVD has less information capacity per layer (15 gigabytes instead of 25). HD DVD shares the same basic disc structure as a standard DVD: back-to-back bonding of two 0.6 mm thick, 120 mm diameter substrates. The 30 GB dual-layer HD DVDs have been used on nearly every movie released in this format.”

EVD does have the same limitation that HD DVD has which is the wavelength of a red laser hence the reason that there is a lower ceiling to how much data can be put on the disk.