It should, but they might not even be in 360's for 6 months or more. All they are are more efficient chips that will likely make the console quieter and more reliable, but no one knows when they're coming. But I believe even new chips were ordered by Microsoft for 2009 (Or so)
EDIT: Just found this article. Premiums will be $300 at Office Depot, after a $50 rebate. Maybe this'll save you some cash:
http://www.xbox360fanboy.com/2007/09...-office-depot/