"Red" BD-9?

[Wiggin15]

http://slashdot.org/articles/05/11/15/161200.shtml
http://news.yahoo.com/s/pcworld/123491

"We wanted the player to be capable of playing back a [9GB] high-definition red-laser disc, which we call BD-9," says Cardwell. "[The disc] would have a high enough capacity for our movies, and it would have a lower cost than the [25GB] BD-25. The advantage would be lower costs to manufacture the disc, because it could be manufactured on existing [DVD production] lines. Certainly, most of our movies will fit on a BD-9. The issue will be how much enhanced content will we put on there. For basic movies, most will fit on BD-9."

This is new to me. Kinda takes the "Blu" off the name...
Is 9GB even enough for a High Definition movie? And why not just use DVD-9?