In a recent discussion on debianplanet.org:
http://debianplanet.org/node.php?id=1068#comment
Comments were made reguarding gnome 2.6 getting into sarge. If packages like gnome 2.6, and kde 3.2 were in a different repo, then this would only reguard the desktop release. Now grant it, the speed of debian's release cycle is largely dependent on package maintainers fixing their bugs, but splitting the repo would sill help some.
-- Matthew A. Nicholson Matt-Land.com

