The blank media is available in 25 and 50 gig formats. Judging by the cost of TDKs blank discs, it would be a lot cheaper just to buy a huge hard drive, but that's just me The drive itself is going to be available on June 10th for $850.
UPDATE: Akihabara News has a high-def clip of this drive you might want to check out. It is not of it in action still it is in high definition.
[via Akihabara News]