EdStation3 on 12 April 2011
The PS4 won't be that much more expensive since BD technology is common now and it will only require tweaking it to read triple or quad layered discs.
360 went with an obsolete format this gen, so they'll have to invest resources in replacing DVD with some propriatery disc OR go with bluray and pay royalties. It's going to cost them more to compete next generation.
Also PS4 will have incentive to be bought since it plays BD movies while Xbox720 will play some propriatery disc that's only good for games.
