Sony is not going to another disk format yet. They learned their lesson and don't want to price themselves out of the market again. 4-8 speed blu-ray drives should be cheap by the time the ps4 comes out. 50gb will still be plenty for a game next gen.
Ms will put a blu-ray drive into their system too. They don't want to miss out on people that want to watch movies on blu-ray. Maybe they'll put a cheaper download only sku on the market as well to have the cheaper console again. Arcade with wireless-n and 320gb, Elite with blu-ray and 640gb.
Maybe nintendo will come with a gamecube size blu-ray disk?







