Currently, the 400GB disc is slated to hit mass production sometime between now and 2010, while rewritable versions won't hit until 2010 to 2012. Not like it really matters though -- a 1TB disc is on track for 2013, and you know you'll be waiting for the latest and greatest.

http://www.engadget.com/2008/12/02/p...rms-compatibi/