I thought Bethesda was trying to keep it down one DVD? At least, I think I read that in a thread about the map being roughly the same size as Oblivion. And in any case, if the game doesn't fit on one DVD, making the PC cersion use multiple disks, swapping out the DVD when you install the game isn't really that hard, and that's the only time you'd need to use all disks on the PC version, if the game used multiple disks. Otherwise, you'd really just need one of them for the DVD check, and I'm assuming there will be a DVD check.
Releasing the game only on Blue-Ray on the PC version would be foolish as many PCs don't have such drives yet, my own included.
Could anyone enlighten me to the potential size of a DVD these days? I know they get better all the time, but am a bit unsure to their actual limits these days. In that case, it'd be bigger than Oblivion in terms of game data, which'll be required for all the innovations they're making :hubbahubba:
& I wasn't suggesting only blu-ray, but as an option.