Its been long known that HD-DVD has capability to do triple layer. Its also known that Blu0ray has 100gb quad layer disks.
I'm not on the side of BluRay here, just saying this news is irrelevant in the "war".
Edit: BTW, the Quad Layer BluRay disk has double the speed of a normal 1 or 2 layer disk.
linkage to 100gb Quad BluRay